1056616561 has 24 divisors (see below), whose sum is σ = 1426486464. Its totient is φ = 759994560.

The previous prime is 1056616531. The next prime is 1056616567. The reversal of 1056616561 is 1656166501.

It is not a de Polignac number, because 1056616561 - 2¹⁵ = 1056583793 is a prime.

It is a super-2 number, since 2×1056616561² = 2232877113958933442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1056616561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056616567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27586 + ... + 53611.

It is an arithmetic number, because the mean of its divisors is an integer number (59436936).

Almost surely, 2^1056616561 is an apocalyptic number.

1056616561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1056616561 is a deficient number, since it is larger than the sum of its proper divisors (369869903).

1056616561 is a wasteful number, since it uses less digits than its factorization.

1056616561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81241 (or 81228 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1056616561 is about 32505.6389108105. The cubic root of 1056616561 is about 1018.5268240549.

The spelling of 1056616561 in words is "one billion, fifty-six million, six hundred sixteen thousand, five hundred sixty-one".