56129917 has 2 divisors, whose sum is σ = 56129918. Its totient is φ = 56129916.

The previous prime is 56129911. The next prime is 56129947. The reversal of 56129917 is 71992165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53377636 + 2752281 = 7306^2 + 1659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56129917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56129917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56129911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28064958 + 28064959.

It is an arithmetic number, because the mean of its divisors is an integer number (28064959).

Almost surely, 2^56129917 is an apocalyptic number.

It is an amenable number.

56129917 is a deficient number, since it is larger than the sum of its proper divisors (1).

56129917 is an equidigital number, since it uses as much as digits as its factorization.

56129917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 40.

The square root of 56129917 is about 7491.9901895291. The cubic root of 56129917 is about 382.8818679136.

The spelling of 56129917 in words is "fifty-six million, one hundred twenty-nine thousand, nine hundred seventeen".