172521960431 has 2 divisors, whose sum is σ = 172521960432. Its totient is φ = 172521960430.

The previous prime is 172521960409. The next prime is 172521960449. The reversal of 172521960431 is 134069125271.

It is a strong prime.

It is an emirp because it is prime and its reverse (134069125271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172521960431 is a prime.

It is a super-2 number, since 2×172521960431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172521960491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86260980215 + 86260980216.

It is an arithmetic number, because the mean of its divisors is an integer number (86260980216).

Almost surely, 2^172521960431 is an apocalyptic number.

172521960431 is a deficient number, since it is larger than the sum of its proper divisors (1).

172521960431 is an equidigital number, since it uses as much as digits as its factorization.

172521960431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 172521960431 in words is "one hundred seventy-two billion, five hundred twenty-one million, nine hundred sixty thousand, four hundred thirty-one".