215312297 has 2 divisors, whose sum is σ = 215312298. Its totient is φ = 215312296.

The previous prime is 215312291. The next prime is 215312323. The reversal of 215312297 is 792213512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202236841 + 13075456 = 14221^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 215312297 - 2⁶ = 215312233 is a prime.

It is not a weakly prime, because it can be changed into another prime (215312291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107656148 + 107656149.

It is an arithmetic number, because the mean of its divisors is an integer number (107656149).

Almost surely, 2^215312297 is an apocalyptic number.

It is an amenable number.

215312297 is a deficient number, since it is larger than the sum of its proper divisors (1).

215312297 is an equidigital number, since it uses as much as digits as its factorization.

215312297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 215312297 is about 14673.5236736102. The cubic root of 215312297 is about 599.3625609886.

The spelling of 215312297 in words is "two hundred fifteen million, three hundred twelve thousand, two hundred ninety-seven".