90172951 has 6 divisors (see below), whose sum is σ = 99115856. Its totient is φ = 81975300.

The previous prime is 90172939. The next prime is 90172967. The reversal of 90172951 is 15927109.

It is a de Polignac number, because none of the positive numbers 2^k-90172951 is a prime.

It is a super-2 number, since 2×90172951² = 16262322184096802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90172991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 372495 + ... + 372736.

Almost surely, 2^90172951 is an apocalyptic number.

90172951 is a deficient number, since it is larger than the sum of its proper divisors (8942905).

90172951 is a wasteful number, since it uses less digits than its factorization.

90172951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745253 (or 745242 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 90172951 is about 9495.9439235918. The cubic root of 90172951 is about 448.4273515030.

The spelling of 90172951 in words is "ninety million, one hundred seventy-two thousand, nine hundred fifty-one".