1056431657 has 2 divisors, whose sum is σ = 1056431658. Its totient is φ = 1056431656.

The previous prime is 1056431617. The next prime is 1056431683. The reversal of 1056431657 is 7561346501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 642064921 + 414366736 = 25339^2 + 20356^2 .

It is a cyclic number.

It is not a de Polignac number, because 1056431657 - 2¹⁶ = 1056366121 is a prime.

It is a super-2 number, since 2×1056431657² = 2232095691823531298, 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 1056431657.

It is not a weakly prime, because it can be changed into another prime (1056431617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528215828 + 528215829.

It is an arithmetic number, because the mean of its divisors is an integer number (528215829).

Almost surely, 2^1056431657 is an apocalyptic number.

It is an amenable number.

1056431657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1056431657 is an equidigital number, since it uses as much as digits as its factorization.

1056431657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 1056431657 is about 32502.7946029261. The cubic root of 1056431657 is about 1018.4674077767.

The spelling of 1056431657 in words is "one billion, fifty-six million, four hundred thirty-one thousand, six hundred fifty-seven".