28056311531 has 2 divisors, whose sum is σ = 28056311532. Its totient is φ = 28056311530.

The previous prime is 28056311519. The next prime is 28056311537. The reversal of 28056311531 is 13511365082.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28056311531 is a prime.

It is a super-2 number, since 2×28056311531² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28056311491 and 28056311500.

It is not a weakly prime, because it can be changed into another prime (28056311537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14028155765 + 14028155766.

It is an arithmetic number, because the mean of its divisors is an integer number (14028155766).

Almost surely, 2^28056311531 is an apocalyptic number.

28056311531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056311531 is an equidigital number, since it uses as much as digits as its factorization.

28056311531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 28056311531 in words is "twenty-eight billion, fifty-six million, three hundred eleven thousand, five hundred thirty-one".