215197057 has 2 divisors, whose sum is σ = 215197058. Its totient is φ = 215197056.

The previous prime is 215197049. The next prime is 215197061. The reversal of 215197057 is 750791512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140564736 + 74632321 = 11856^2 + 8639^2 .

It is a cyclic number.

It is not a de Polignac number, because 215197057 - 2³ = 215197049 is a prime.

It is a super-2 number, since 2×215197057² = 92619546682922498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215197457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107598528 + 107598529.

It is an arithmetic number, because the mean of its divisors is an integer number (107598529).

Almost surely, 2^215197057 is an apocalyptic number.

It is an amenable number.

215197057 is a deficient number, since it is larger than the sum of its proper divisors (1).

215197057 is an equidigital number, since it uses as much as digits as its factorization.

215197057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22050, while the sum is 37.

The square root of 215197057 is about 14669.5963475482. The cubic root of 215197057 is about 599.2556111165.

The spelling of 215197057 in words is "two hundred fifteen million, one hundred ninety-seven thousand, fifty-seven".