91431492 has 12 divisors (see below), whose sum is σ = 213340176. Its totient is φ = 30477160.

The previous prime is 91431481. The next prime is 91431511. The reversal of 91431492 is 29413419.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3809634 + ... + 3809657.

It is an arithmetic number, because the mean of its divisors is an integer number (17778348).

Almost surely, 2^91431492 is an apocalyptic number.

It is an amenable number.

91431492 is an abundant number, since it is smaller than the sum of its proper divisors (121908684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91431492 is a wasteful number, since it uses less digits than its factorization.

91431492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7619298 (or 7619296 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 91431492 is about 9561.9815937911. The cubic root of 91431492 is about 450.5039490038.

The spelling of 91431492 in words is "ninety-one million, four hundred thirty-one thousand, four hundred ninety-two".