91243231 has 8 divisors (see below), whose sum is σ = 95376384. Its totient is φ = 87123960.

The previous prime is 91243181. The next prime is 91243241. The reversal of 91243231 is 13234219.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91243231 - 2²³ = 82854623 is a prime.

It is a super-2 number, since 2×91243231² = 16650654406638722, 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 = 91243196 and 91243205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91243241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11370 + ... + 17656.

It is an arithmetic number, because the mean of its divisors is an integer number (11922048).

Almost surely, 2^91243231 is an apocalyptic number.

91243231 is a deficient number, since it is larger than the sum of its proper divisors (4133153).

91243231 is a wasteful number, since it uses less digits than its factorization.

91243231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6941.

The product of its digits is 1296, while the sum is 25.

The square root of 91243231 is about 9552.1322750473. The cubic root of 91243231 is about 450.1945348206.

The spelling of 91243231 in words is "ninety-one million, two hundred forty-three thousand, two hundred thirty-one".