172040431 has 2 divisors, whose sum is σ = 172040432. Its totient is φ = 172040430.

The previous prime is 172040419. The next prime is 172040507. The reversal of 172040431 is 134040271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172040431 - 2⁵ = 172040399 is a prime.

It is a super-2 number, since 2×172040431² = 59195819797331522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172040131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86020215 + 86020216.

It is an arithmetic number, because the mean of its divisors is an integer number (86020216).

Almost surely, 2^172040431 is an apocalyptic number.

172040431 is a deficient number, since it is larger than the sum of its proper divisors (1).

172040431 is an equidigital number, since it uses as much as digits as its factorization.

172040431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 172040431 is about 13116.4183754560. The cubic root of 172040431 is about 556.1733485929.

The spelling of 172040431 in words is "one hundred seventy-two million, forty thousand, four hundred thirty-one".