91971272 has 16 divisors (see below), whose sum is σ = 172945500. Its totient is φ = 45852480.

The previous prime is 91971259. The next prime is 91971277. The reversal of 91971272 is 27217919.

It can be written as a sum of positive squares in 2 ways, for example, as 81252196 + 10719076 = 9014^2 + 3274^2 .

It is a super-3 number, since 3×91971272³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (91971277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13679 + ... + 19262.

Almost surely, 2^91971272 is an apocalyptic number.

It is an amenable number.

91971272 is a deficient number, since it is larger than the sum of its proper divisors (80974228).

91971272 is a wasteful number, since it uses less digits than its factorization.

91971272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33296 (or 33292 counting only the distinct ones).

The product of its digits is 15876, while the sum is 38.

The square root of 91971272 is about 9590.1653791788. The cubic root of 91971272 is about 451.3887500830.

The spelling of 91971272 in words is "ninety-one million, nine hundred seventy-one thousand, two hundred seventy-two".