91431 has 6 divisors (see below), whose sum is σ = 132080. Its totient is φ = 60948.
The previous prime is 91423. The next prime is 91433. The reversal of 91431 is 13419.
It is not a de Polignac number, because 91431 - 23 = 91423 is a prime.
It is a super-2 number, since 2×914312 = 16719255522, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91431.
It is not an unprimeable number, because it can be changed into a prime (91433) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5071 + ... + 5088.
291431 is an apocalyptic number.
91431 is a deficient number, since it is larger than the sum of its proper divisors (40649).
91431 is a wasteful number, since it uses less digits than its factorization.
91431 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 10165 (or 10162 counting only the distinct ones).
The product of its digits is 108, while the sum is 18.
The square root of 91431 is about 302.3755942532. The cubic root of 91431 is about 45.0503140937.
The spelling of 91431 in words is "ninety-one thousand, four hundred thirty-one".
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