56405431 has 2 divisors, whose sum is σ = 56405432. Its totient is φ = 56405430.

The previous prime is 56405413. The next prime is 56405449. The reversal of 56405431 is 13450465.

Together with previous prime (56405413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (56405413) and next prime (56405449).

It is a cyclic number.

It is not a de Polignac number, because 56405431 - 2²¹ = 54308279 is a prime.

It is a super-2 number, since 2×56405431² = 6363145292591522, which contains 22 as substring.

It is equal to p_3361087 and since 56405431 and 3361087 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56405431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56405231) 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, 28202715 + 28202716.

It is an arithmetic number, because the mean of its divisors is an integer number (28202716).

Almost surely, 2^56405431 is an apocalyptic number.

56405431 is a deficient number, since it is larger than the sum of its proper divisors (1).

56405431 is an equidigital number, since it uses as much as digits as its factorization.

56405431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 56405431 is about 7510.3549183777. The cubic root of 56405431 is about 383.5073049439.

Adding to 56405431 its reverse (13450465), we get a palindrome (69855896).

The spelling of 56405431 in words is "fifty-six million, four hundred five thousand, four hundred thirty-one".