91273287 has 16 divisors (see below), whose sum is σ = 140990720. Its totient is φ = 51440832.

The previous prime is 91273279. The next prime is 91273297. The reversal of 91273287 is 78237219.

It is not a de Polignac number, because 91273287 - 2³ = 91273279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91273297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28237 + ... + 31302.

It is an arithmetic number, because the mean of its divisors is an integer number (8811920).

Almost surely, 2^91273287 is an apocalyptic number.

91273287 is a deficient number, since it is larger than the sum of its proper divisors (49717433).

91273287 is a wasteful number, since it uses less digits than its factorization.

91273287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59622.

The product of its digits is 42336, while the sum is 39.

The square root of 91273287 is about 9553.7054068042. The cubic root of 91273287 is about 450.2439615427.

The spelling of 91273287 in words is "ninety-one million, two hundred seventy-three thousand, two hundred eighty-seven".