56391131 has 2 divisors, whose sum is σ = 56391132. Its totient is φ = 56391130.

The previous prime is 56391059. The next prime is 56391133. The reversal of 56391131 is 13119365.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56391131 - 2¹⁰ = 56390107 is a prime.

It is a super-2 number, since 2×56391131² = 6359919310918322, which contains 22 as substring.

Together with 56391133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 56391094 and 56391103.

It is not a weakly prime, because it can be changed into another prime (56391133) 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, 28195565 + 28195566.

It is an arithmetic number, because the mean of its divisors is an integer number (28195566).

Almost surely, 2^56391131 is an apocalyptic number.

56391131 is a deficient number, since it is larger than the sum of its proper divisors (1).

56391131 is an equidigital number, since it uses as much as digits as its factorization.

56391131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 29.

The square root of 56391131 is about 7509.4028391078. The cubic root of 56391131 is about 383.4748930651.

The spelling of 56391131 in words is "fifty-six million, three hundred ninety-one thousand, one hundred thirty-one".