172968881 has 2 divisors, whose sum is σ = 172968882. Its totient is φ = 172968880.

The previous prime is 172968857. The next prime is 172968911. The reversal of 172968881 is 188869271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91680625 + 81288256 = 9575^2 + 9016^2 .

It is a cyclic number.

It is not a de Polignac number, because 172968881 - 2²⁶ = 105860017 is a prime.

It is a super-2 number, since 2×172968881² = 59836467588784322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (172968811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86484440 + 86484441.

It is an arithmetic number, because the mean of its divisors is an integer number (86484441).

Almost surely, 2^172968881 is an apocalyptic number.

It is an amenable number.

172968881 is a deficient number, since it is larger than the sum of its proper divisors (1).

172968881 is an equidigital number, since it uses as much as digits as its factorization.

172968881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 50.

The square root of 172968881 is about 13151.7634178843. The cubic root of 172968881 is about 557.1720537688.

The spelling of 172968881 in words is "one hundred seventy-two million, nine hundred sixty-eight thousand, eight hundred eighty-one".