56131820 has 24 divisors (see below), whose sum is σ = 121942800. Its totient is φ = 21678272.

The previous prime is 56131811. The next prime is 56131847. The reversal of 56131820 is 2813165.

It is a self number, because there is not a number n which added to its sum of digits gives 56131820.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47810 + ... + 48969.

It is an arithmetic number, because the mean of its divisors is an integer number (5080950).

Almost surely, 2^56131820 is an apocalyptic number.

It is an amenable number.

56131820 is an abundant number, since it is smaller than the sum of its proper divisors (65810980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56131820 is a wasteful number, since it uses less digits than its factorization.

56131820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96817 (or 96815 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 56131820 is about 7492.1171907546. The cubic root of 56131820 is about 382.8861948750.

Adding to 56131820 its reverse (2813165), we get a palindrome (58944985).

The spelling of 56131820 in words is "fifty-six million, one hundred thirty-one thousand, eight hundred twenty".