1054561561 has 4 divisors (see below), whose sum is σ = 1116594612. Its totient is φ = 992528512.

The previous prime is 1054561559. The next prime is 1054561591. The reversal of 1054561561 is 1651654501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 302760000 + 751801561 = 17400^2 + 27419^2 .

It is a cyclic number.

It is not a de Polignac number, because 1054561561 - 2¹ = 1054561559 is a prime.

It is a super-2 number, since 2×1054561561² = 2224200171877513442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1054561591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31016500 + ... + 31016533.

It is an arithmetic number, because the mean of its divisors is an integer number (279148653).

Almost surely, 2^1054561561 is an apocalyptic number.

It is an amenable number.

1054561561 is a deficient number, since it is larger than the sum of its proper divisors (62033051).

1054561561 is an equidigital number, since it uses as much as digits as its factorization.

1054561561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62033050.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 1054561561 is about 32474.0136262828. The cubic root of 1054561561 is about 1017.8660889315.

The spelling of 1054561561 in words is "one billion, fifty-four million, five hundred sixty-one thousand, five hundred sixty-one".