56420831 has 2 divisors, whose sum is σ = 56420832. Its totient is φ = 56420830.

The previous prime is 56420813. The next prime is 56420839. The reversal of 56420831 is 13802465.

Together with previous prime (56420813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56420831 - 2²² = 52226527 is a prime.

It is a super-2 number, since 2×56420831² = 6366620341461122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56420794 and 56420803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56420839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28210415 + 28210416.

It is an arithmetic number, because the mean of its divisors is an integer number (28210416).

Almost surely, 2^56420831 is an apocalyptic number.

56420831 is a deficient number, since it is larger than the sum of its proper divisors (1).

56420831 is an equidigital number, since it uses as much as digits as its factorization.

56420831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 56420831 is about 7511.3800995556. The cubic root of 56420831 is about 383.5422039183.

The spelling of 56420831 in words is "fifty-six million, four hundred twenty thousand, eight hundred thirty-one".