56531311 has 2 divisors, whose sum is σ = 56531312. Its totient is φ = 56531310.

The previous prime is 56531303. The next prime is 56531329. The reversal of 56531311 is 11313565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56531311 - 2³ = 56531303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56531351) 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, 28265655 + 28265656.

It is an arithmetic number, because the mean of its divisors is an integer number (28265656).

Almost surely, 2^56531311 is an apocalyptic number.

56531311 is a deficient number, since it is larger than the sum of its proper divisors (1).

56531311 is an equidigital number, since it uses as much as digits as its factorization.

56531311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 25.

The square root of 56531311 is about 7518.7306774482. The cubic root of 56531311 is about 383.7923840619.

Adding to 56531311 its reverse (11313565), we get a palindrome (67844876).

The spelling of 56531311 in words is "fifty-six million, five hundred thirty-one thousand, three hundred eleven".