56431237 has 2 divisors, whose sum is σ = 56431238. Its totient is φ = 56431236.

The previous prime is 56431223. The next prime is 56431247. The reversal of 56431237 is 73213465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31371201 + 25060036 = 5601^2 + 5006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56431237 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 56431199 and 56431208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56431247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28215618 + 28215619.

It is an arithmetic number, because the mean of its divisors is an integer number (28215619).

Almost surely, 2^56431237 is an apocalyptic number.

It is an amenable number.

56431237 is a deficient number, since it is larger than the sum of its proper divisors (1).

56431237 is an equidigital number, since it uses as much as digits as its factorization.

56431237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 31.

The square root of 56431237 is about 7512.0727499140. The cubic root of 56431237 is about 383.5657820588.

The spelling of 56431237 in words is "fifty-six million, four hundred thirty-one thousand, two hundred thirty-seven".