1056661609 has 8 divisors (see below), whose sum is σ = 1064468160. Its totient is φ = 1048866000.

The previous prime is 1056661579. The next prime is 1056661631. The reversal of 1056661609 is 9061666501.

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 1056661609 - 2¹⁵ = 1056628841 is a prime.

It is a super-2 number, since 2×1056661609² = 2233067511868937762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1056661679) 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, 358062 + ... + 361000.

It is an arithmetic number, because the mean of its divisors is an integer number (133058520).

Almost surely, 2^1056661609 is an apocalyptic number.

It is an amenable number.

1056661609 is a deficient number, since it is larger than the sum of its proper divisors (7806551).

1056661609 is a wasteful number, since it uses less digits than its factorization.

1056661609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5471.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 1056661609 is about 32506.3318293529. The cubic root of 1056661609 is about 1018.5412985408.

The spelling of 1056661609 in words is "one billion, fifty-six million, six hundred sixty-one thousand, six hundred nine".