91873957 has 4 divisors (see below), whose sum is σ = 104998816. Its totient is φ = 78749100.

The previous prime is 91873939. The next prime is 91873961. The reversal of 91873957 is 75937819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75937819 = 3329 ⋅22811.

It is a cyclic number.

It is not a de Polignac number, because 91873957 - 2²³ = 83485349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91873957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91873357) 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, 6562419 + ... + 6562432.

It is an arithmetic number, because the mean of its divisors is an integer number (26249704).

Almost surely, 2^91873957 is an apocalyptic number.

It is an amenable number.

91873957 is a deficient number, since it is larger than the sum of its proper divisors (13124859).

91873957 is a wasteful number, since it uses less digits than its factorization.

91873957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13124858.

The product of its digits is 476280, while the sum is 49.

The square root of 91873957 is about 9585.0903490786. The cubic root of 91873957 is about 451.2294887636.

The spelling of 91873957 in words is "ninety-one million, eight hundred seventy-three thousand, nine hundred fifty-seven".