91751431 has 12 divisors (see below), whose sum is σ = 99136440. Its totient is φ = 84874880.

The previous prime is 91751377. The next prime is 91751441. The reversal of 91751431 is 13415719.

It is not a de Polignac number, because 91751431 - 2¹⁷ = 91620359 is a prime.

It is a super-2 number, since 2×91751431² = 16836650181095522, 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 = 91751393 and 91751402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91751441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14361 + ... + 19741.

It is an arithmetic number, because the mean of its divisors is an integer number (8261370).

Almost surely, 2^91751431 is an apocalyptic number.

91751431 is a deficient number, since it is larger than the sum of its proper divisors (7385009).

91751431 is a wasteful number, since it uses less digits than its factorization.

91751431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5474 (or 5457 counting only the distinct ones).

The product of its digits is 3780, while the sum is 31.

The square root of 91751431 is about 9578.6967276347. The cubic root of 91751431 is about 451.0288082443.

The spelling of 91751431 in words is "ninety-one million, seven hundred fifty-one thousand, four hundred thirty-one".