91240431 has 16 divisors (see below), whose sum is σ = 123512928. Its totient is φ = 59904000.

The previous prime is 91240427. The next prime is 91240441. The reversal of 91240431 is 13404219.

It is not a de Polignac number, because 91240431 - 2² = 91240427 is a prime.

It is a super-2 number, since 2×91240431² = 16649632498131522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91240421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69481 + ... + 70781.

It is an arithmetic number, because the mean of its divisors is an integer number (7719558).

Almost surely, 2^91240431 is an apocalyptic number.

91240431 is a deficient number, since it is larger than the sum of its proper divisors (32272497).

91240431 is a wasteful number, since it uses less digits than its factorization.

91240431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 91240431 is about 9551.9857097883. The cubic root of 91240431 is about 450.1899297024.

The spelling of 91240431 in words is "ninety-one million, two hundred forty thousand, four hundred thirty-one".