1056647561 has 8 divisors (see below), whose sum is σ = 1085166720. Its totient is φ = 1028380048.

The previous prime is 1056647503. The next prime is 1056647569. The reversal of 1056647561 is 1657466501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1056647561 - 2¹⁸ = 1056385417 is a prime.

It is a super-2 number, since 2×1056647561² = 2233008136334497442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1056647569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54386 + ... + 71211.

It is an arithmetic number, because the mean of its divisors is an integer number (135645840).

Almost surely, 2^1056647561 is an apocalyptic number.

It is an amenable number.

1056647561 is a deficient number, since it is larger than the sum of its proper divisors (28519159).

1056647561 is a wasteful number, since it uses less digits than its factorization.

1056647561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125823.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 1056647561 is about 32506.1157476559. The cubic root of 1056647561 is about 1018.5367847868.

The spelling of 1056647561 in words is "one billion, fifty-six million, six hundred forty-seven thousand, five hundred sixty-one".