215957137 has 32 divisors (see below), whose sum is σ = 258660864. Its totient is φ = 178080000.

The previous prime is 215957117. The next prime is 215957149. The reversal of 215957137 is 731759512.

It is a cyclic number.

It is not a de Polignac number, because 215957137 - 2⁷ = 215957009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215957137.

It is not an unprimeable number, because it can be changed into a prime (215957107) 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 in 31 ways as a sum of consecutive naturals, for example, 860262 + ... + 860512.

It is an arithmetic number, because the mean of its divisors is an integer number (8083152).

Almost surely, 2^215957137 is an apocalyptic number.

It is an amenable number.

215957137 is a deficient number, since it is larger than the sum of its proper divisors (42703727).

215957137 is a wasteful number, since it uses less digits than its factorization.

215957137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429.

The product of its digits is 66150, while the sum is 40.

The square root of 215957137 is about 14695.4801554764. The cubic root of 215957137 is about 599.9603094115.

The spelling of 215957137 in words is "two hundred fifteen million, nine hundred fifty-seven thousand, one hundred thirty-seven".