172113979 has 2 divisors, whose sum is σ = 172113980. Its totient is φ = 172113978.

The previous prime is 172113971. The next prime is 172114003. The reversal of 172113979 is 979311271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172113979 - 2³ = 172113971 is a prime.

It is equal to p_9614749 and since 172113979 and 9614749 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (172113971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86056989 + 86056990.

It is an arithmetic number, because the mean of its divisors is an integer number (86056990).

Almost surely, 2^172113979 is an apocalyptic number.

172113979 is a deficient number, since it is larger than the sum of its proper divisors (1).

172113979 is an equidigital number, since it uses as much as digits as its factorization.

172113979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 40.

The square root of 172113979 is about 13119.2217375879. The cubic root of 172113979 is about 556.2525927750.

The spelling of 172113979 in words is "one hundred seventy-two million, one hundred thirteen thousand, nine hundred seventy-nine".