56311131 has 4 divisors (see below), whose sum is σ = 75081512. Its totient is φ = 37540752.

The previous prime is 56311109. The next prime is 56311141. The reversal of 56311131 is 13111365.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-56311131 is a prime.

It is a super-2 number, since 2×56311131² = 6341886948998322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56311098 and 56311107.

It is not an unprimeable number, because it can be changed into a prime (56311141) 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 in 3 ways as a sum of consecutive naturals, for example, 9385186 + ... + 9385191.

It is an arithmetic number, because the mean of its divisors is an integer number (18770378).

Almost surely, 2^56311131 is an apocalyptic number.

56311131 is a deficient number, since it is larger than the sum of its proper divisors (18770381).

56311131 is a wasteful number, since it uses less digits than its factorization.

56311131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18770380.

The product of its digits is 270, while the sum is 21.

The square root of 56311131 is about 7504.0742933423. The cubic root of 56311131 is about 383.2934667215.

Adding to 56311131 its reverse (13111365), we get a palindrome (69422496).

It can be divided in two parts, 5 and 6311131, that added together give a palindrome (6311136).

The spelling of 56311131 in words is "fifty-six million, three hundred eleven thousand, one hundred thirty-one".