215925197 has 2 divisors, whose sum is σ = 215925198. Its totient is φ = 215925196.

The previous prime is 215925181. The next prime is 215925221. The reversal of 215925197 is 791529512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116942596 + 98982601 = 10814^2 + 9949^2 .

It is a cyclic number.

It is not a de Polignac number, because 215925197 - 2⁴ = 215925181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215925107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107962598 + 107962599.

It is an arithmetic number, because the mean of its divisors is an integer number (107962599).

Almost surely, 2^215925197 is an apocalyptic number.

It is an amenable number.

215925197 is a deficient number, since it is larger than the sum of its proper divisors (1).

215925197 is an equidigital number, since it uses as much as digits as its factorization.

215925197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 41.

The square root of 215925197 is about 14694.3933865948. The cubic root of 215925197 is about 599.9307299660.

The spelling of 215925197 in words is "two hundred fifteen million, nine hundred twenty-five thousand, one hundred ninety-seven".