561835696249 has 3 divisors (see below), whose sum is σ = 561836445807. Its totient is φ = 561834946692.

The previous prime is 561835696223. The next prime is 561835696277. The reversal of 561835696249 is 942696538165.

The square root of 561835696249 is 749557.

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, and also an emirpimes, since its reverse is a distinct semiprime: 942696538165 = 5 ⋅188539307633.

It can be written as a sum of positive squares in only one way, i.e., 68374405225 + 493461291024 = 261485^2 + 702468^2 .

It is a de Polignac number, because none of the positive numbers 2^k-561835696249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561835696349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 374779 + ... + 1124335.

It is an arithmetic number, because the mean of its divisors is an integer number (187278815269).

Almost surely, 2^561835696249 is an apocalyptic number.

561835696249 is the 749557-th square number.

561835696249 is the 374779-th centered octagonal number.

It is an amenable number.

561835696249 is a deficient number, since it is larger than the sum of its proper divisors (749558).

561835696249 is an frugal number, since it uses more digits than its factorization.

561835696249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499114 (or 749557 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 64.

Multiplying 561835696249 by its sum of digits (64), we get a square (35957484559936 = 5996456²).

The spelling of 561835696249 in words is "five hundred sixty-one billion, eight hundred thirty-five million, six hundred ninety-six thousand, two hundred forty-nine".