215672161 has 2 divisors, whose sum is σ = 215672162. Its totient is φ = 215672160.

The previous prime is 215672141. The next prime is 215672167. The reversal of 215672161 is 161276512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202891536 + 12780625 = 14244^2 + 3575^2 .

It is a cyclic number.

It is not a de Polignac number, because 215672161 - 2⁷ = 215672033 is a prime.

It is not a weakly prime, because it can be changed into another prime (215672167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107836080 + 107836081.

It is an arithmetic number, because the mean of its divisors is an integer number (107836081).

Almost surely, 2^215672161 is an apocalyptic number.

It is an amenable number.

215672161 is a deficient number, since it is larger than the sum of its proper divisors (1).

215672161 is an equidigital number, since it uses as much as digits as its factorization.

215672161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 215672161 is about 14685.7809121613. The cubic root of 215672161 is about 599.6962916651.

The spelling of 215672161 in words is "two hundred fifteen million, six hundred seventy-two thousand, one hundred sixty-one".