56540761531 has 2 divisors, whose sum is σ = 56540761532. Its totient is φ = 56540761530.

The previous prime is 56540761489. The next prime is 56540761633. The reversal of 56540761531 is 13516704565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56540761531 - 2⁹ = 56540761019 is a prime.

It is a super-3 number, since 3×56540761531³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (56540761331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28270380765 + 28270380766.

It is an arithmetic number, because the mean of its divisors is an integer number (28270380766).

Almost surely, 2^56540761531 is an apocalyptic number.

56540761531 is a deficient number, since it is larger than the sum of its proper divisors (1).

56540761531 is an equidigital number, since it uses as much as digits as its factorization.

56540761531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 56540761531 in words is "fifty-six billion, five hundred forty million, seven hundred sixty-one thousand, five hundred thirty-one".