91980431 has 4 divisors (see below), whose sum is σ = 95152200. Its totient is φ = 88808664.

The previous prime is 91980401. The next prime is 91980433. The reversal of 91980431 is 13408919.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91980431 - 2¹⁸ = 91718287 is a prime.

It is a super-2 number, since 2×91980431² = 16920799373891522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91980391 and 91980400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91980433) 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, 1585841 + ... + 1585898.

It is an arithmetic number, because the mean of its divisors is an integer number (23788050).

Almost surely, 2^91980431 is an apocalyptic number.

91980431 is a deficient number, since it is larger than the sum of its proper divisors (3171769).

91980431 is a wasteful number, since it uses less digits than its factorization.

91980431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171768.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 91980431 is about 9590.6428877318. The cubic root of 91980431 is about 451.4037335021.

The spelling of 91980431 in words is "ninety-one million, nine hundred eighty thousand, four hundred thirty-one".