215164997 has 2 divisors, whose sum is σ = 215164998. Its totient is φ = 215164996.

The previous prime is 215164979. The next prime is 215165009. The reversal of 215164997 is 799461512.

Together with previous prime (215164979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215091556 + 73441 = 14666^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 215164997 - 2⁶ = 215164933 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 (215164097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107582498 + 107582499.

It is an arithmetic number, because the mean of its divisors is an integer number (107582499).

Almost surely, 2^215164997 is an apocalyptic number.

It is an amenable number.

215164997 is a deficient number, since it is larger than the sum of its proper divisors (1).

215164997 is an equidigital number, since it uses as much as digits as its factorization.

215164997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 215164997 is about 14668.5035705760. The cubic root of 215164997 is about 599.2258506583.

The spelling of 215164997 in words is "two hundred fifteen million, one hundred sixty-four thousand, nine hundred ninety-seven".