166170931 has 2 divisors, whose sum is σ = 166170932. Its totient is φ = 166170930.

The previous prime is 166170919. The next prime is 166170997. The reversal of 166170931 is 139071661.

It is a weak prime.

It is an emirp because it is prime and its reverse (139071661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166170931 - 2⁹ = 166170419 is a prime.

It is a super-2 number, since 2×166170931² = 55225556618813522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166170131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83085465 + 83085466.

It is an arithmetic number, because the mean of its divisors is an integer number (83085466).

Almost surely, 2^166170931 is an apocalyptic number.

166170931 is a deficient number, since it is larger than the sum of its proper divisors (1).

166170931 is an equidigital number, since it uses as much as digits as its factorization.

166170931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 166170931 is about 12890.7304292658. The cubic root of 166170931 is about 549.7750385772.

The spelling of 166170931 in words is "one hundred sixty-six million, one hundred seventy thousand, nine hundred thirty-one".