1056893631581 has 8 divisors (see below), whose sum is σ = 1060763984184. Its totient is φ = 1053024053760.

The previous prime is 1056893631551. The next prime is 1056893631583. The reversal of 1056893631581 is 1851363986501.

It can be written as a sum of positive squares in 4 ways, for example, as 224264756356 + 832628875225 = 473566^2 + 912485^2 .

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 1056893631581 - 2³⁰ = 1055819889757 is a prime.

It is a super-2 number, since 2×1056893631581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056893631583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2613845 + ... + 2990981.

It is an arithmetic number, because the mean of its divisors is an integer number (132595498023).

Almost surely, 2^{1056893631581} is an apocalyptic number.

It is an amenable number.

1056893631581 is a deficient number, since it is larger than the sum of its proper divisors (3870352603).

1056893631581 is an equidigital number, since it uses as much as digits as its factorization.

1056893631581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387391.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 1056893631581 in words is "one trillion, fifty-six billion, eight hundred ninety-three million, six hundred thirty-one thousand, five hundred eighty-one".