56131885477 has 2 divisors, whose sum is σ = 56131885478. Its totient is φ = 56131885476.

The previous prime is 56131885429. The next prime is 56131885499. The reversal of 56131885477 is 77458813165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42152606721 + 13979278756 = 205311^2 + 118234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56131885477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56131885427) 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, 28065942738 + 28065942739.

It is an arithmetic number, because the mean of its divisors is an integer number (28065942739).

Almost surely, 2^56131885477 is an apocalyptic number.

It is an amenable number.

56131885477 is a deficient number, since it is larger than the sum of its proper divisors (1).

56131885477 is an equidigital number, since it uses as much as digits as its factorization.

56131885477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5644800, while the sum is 55.

The spelling of 56131885477 in words is "fifty-six billion, one hundred thirty-one million, eight hundred eighty-five thousand, four hundred seventy-seven".