172154431 has 2 divisors, whose sum is σ = 172154432. Its totient is φ = 172154430.

The previous prime is 172154429. The next prime is 172154539. The reversal of 172154431 is 134451271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172154431 - 2¹ = 172154429 is a prime.

It is a super-2 number, since 2×172154431² = 59274296225867522, which contains 22 as substring.

Together with 172154429, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 172154431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172154131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86077215 + 86077216.

It is an arithmetic number, because the mean of its divisors is an integer number (86077216).

Almost surely, 2^172154431 is an apocalyptic number.

172154431 is a deficient number, since it is larger than the sum of its proper divisors (1).

172154431 is an equidigital number, since it uses as much as digits as its factorization.

172154431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 172154431 is about 13120.7633543175. The cubic root of 172154431 is about 556.2961680991.

The spelling of 172154431 in words is "one hundred seventy-two million, one hundred fifty-four thousand, four hundred thirty-one".