91431279 has 12 divisors (see below), whose sum is σ = 137809776. Its totient is φ = 58303872.

The previous prime is 91431257. The next prime is 91431283. The reversal of 91431279 is 97213419.

It is not a de Polignac number, because 91431279 - 2⁹ = 91430767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91431209) 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, 220642 + ... + 221055.

It is an arithmetic number, because the mean of its divisors is an integer number (11484148).

Almost surely, 2^91431279 is an apocalyptic number.

91431279 is a deficient number, since it is larger than the sum of its proper divisors (46378497).

91431279 is a wasteful number, since it uses less digits than its factorization.

91431279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441726 (or 441723 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 91431279 is about 9561.9704559259. The cubic root of 91431279 is about 450.5035991702.

The spelling of 91431279 in words is "ninety-one million, four hundred thirty-one thousand, two hundred seventy-nine".