172290431 has 2 divisors, whose sum is σ = 172290432. Its totient is φ = 172290430.

The previous prime is 172290403. The next prime is 172290509. The reversal of 172290431 is 134092271.

It is a weak prime.

It is an emirp because it is prime and its reverse (134092271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172290431 - 2²² = 168096127 is a prime.

It is a super-2 number, since 2×172290431² = 59367985228331522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172290394 and 172290403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172290331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86145215 + 86145216.

It is an arithmetic number, because the mean of its divisors is an integer number (86145216).

Almost surely, 2^172290431 is an apocalyptic number.

172290431 is a deficient number, since it is larger than the sum of its proper divisors (1).

172290431 is an equidigital number, since it uses as much as digits as its factorization.

172290431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 172290431 is about 13125.9449564593. The cubic root of 172290431 is about 556.4426187106.

The spelling of 172290431 in words is "one hundred seventy-two million, two hundred ninety thousand, four hundred thirty-one".