56405317 has 2 divisors, whose sum is σ = 56405318. Its totient is φ = 56405316.

The previous prime is 56405287. The next prime is 56405333. The reversal of 56405317 is 71350465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54552996 + 1852321 = 7386^2 + 1361^2 .

It is a cyclic number.

It is not a de Polignac number, because 56405317 - 2⁷ = 56405189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56405117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28202658 + 28202659.

It is an arithmetic number, because the mean of its divisors is an integer number (28202659).

Almost surely, 2^56405317 is an apocalyptic number.

It is an amenable number.

56405317 is a deficient number, since it is larger than the sum of its proper divisors (1).

56405317 is an equidigital number, since it uses as much as digits as its factorization.

56405317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 56405317 is about 7510.3473288524. The cubic root of 56405317 is about 383.5070465772.

The spelling of 56405317 in words is "fifty-six million, four hundred five thousand, three hundred seventeen".