97172431 has 4 divisors (see below), whose sum is σ = 97523512. Its totient is φ = 96821352.

The previous prime is 97172407. The next prime is 97172443. The reversal of 97172431 is 13427179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13427179 = 53 ⋅253343.

It is a cyclic number.

It is not a de Polignac number, because 97172431 - 2¹⁵ = 97139663 is a prime.

It is a super-2 number, since 2×97172431² = 18884962692899522, 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 (97172461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175125 + ... + 175678.

It is an arithmetic number, because the mean of its divisors is an integer number (24380878).

Almost surely, 2^97172431 is an apocalyptic number.

97172431 is a deficient number, since it is larger than the sum of its proper divisors (351081).

97172431 is a wasteful number, since it uses less digits than its factorization.

97172431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351080.

The product of its digits is 10584, while the sum is 34.

The square root of 97172431 is about 9857.6077726799. The cubic root of 97172431 is about 459.7421853982.

The spelling of 97172431 in words is "ninety-seven million, one hundred seventy-two thousand, four hundred thirty-one".