215707157 has 2 divisors, whose sum is σ = 215707158. Its totient is φ = 215707156.

The previous prime is 215707153. The next prime is 215707201. The reversal of 215707157 is 751707512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215678596 + 28561 = 14686^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 215707157 - 2² = 215707153 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215707153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107853578 + 107853579.

It is an arithmetic number, because the mean of its divisors is an integer number (107853579).

Almost surely, 2^215707157 is an apocalyptic number.

It is an amenable number.

215707157 is a deficient number, since it is larger than the sum of its proper divisors (1).

215707157 is an equidigital number, since it uses as much as digits as its factorization.

215707157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17150, while the sum is 35.

The square root of 215707157 is about 14686.9723564797. The cubic root of 215707157 is about 599.7287264437.

The spelling of 215707157 in words is "two hundred fifteen million, seven hundred seven thousand, one hundred fifty-seven".