1049946559561 has 3 divisors (see below), whose sum is σ = 1049947584231. Its totient is φ = 1049945534892.

The previous prime is 1049946559531. The next prime is 1049946559619. The reversal of 1049946559561 is 1659556499401.

The square root of 1049946559561 is 1024669.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 682637835961 + 367308723600 = 826219^2 + 606060^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1049946559561 is a prime.

It is a super-2 number, since 2×1049946559561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1049946559493 and 1049946559502.

It is not an unprimeable number, because it can be changed into a prime (1049946559531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 512335 + ... + 1537003.

It is an arithmetic number, because the mean of its divisors is an integer number (349982528077).

Almost surely, 2^{1049946559561} is an apocalyptic number.

1049946559561 is the 1024669-th square number.

1049946559561 is the 512335-th centered octagonal number.

It is an amenable number.

1049946559561 is a deficient number, since it is larger than the sum of its proper divisors (1024670).

1049946559561 is an frugal number, since it uses more digits than its factorization.

1049946559561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049338 (or 1024669 counting only the distinct ones).

The product of its (nonzero) digits is 52488000, while the sum is 64.

Multiplying 1049946559561 by its sum of digits (64), we get a square (67196579811904 = 8197352²).

The spelling of 1049946559561 in words is "one trillion, forty-nine billion, nine hundred forty-six million, five hundred fifty-nine thousand, five hundred sixty-one".