172898923 has 2 divisors, whose sum is σ = 172898924. Its totient is φ = 172898922.

The previous prime is 172898897. The next prime is 172898933. The reversal of 172898923 is 329898271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172898923 is a prime.

It is not a weakly prime, because it can be changed into another prime (172898933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86449461 + 86449462.

It is an arithmetic number, because the mean of its divisors is an integer number (86449462).

Almost surely, 2^172898923 is an apocalyptic number.

172898923 is a deficient number, since it is larger than the sum of its proper divisors (1).

172898923 is an equidigital number, since it uses as much as digits as its factorization.

172898923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 172898923 is about 13149.1035055627. The cubic root of 172898923 is about 557.0969267700.

The spelling of 172898923 in words is "one hundred seventy-two million, eight hundred ninety-eight thousand, nine hundred twenty-three".