91271437492 has 48 divisors (see below), whose sum is σ = 174019809600. Its totient is φ = 41721281280.

The previous prime is 91271437471. The next prime is 91271437507. The reversal of 91271437492 is 29473417219.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4687008 + ... + 4706440.

It is an arithmetic number, because the mean of its divisors is an integer number (3625412700).

Almost surely, 2^91271437492 is an apocalyptic number.

It is an amenable number.

91271437492 is a deficient number, since it is larger than the sum of its proper divisors (82748372108).

91271437492 is a wasteful number, since it uses less digits than its factorization.

91271437492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21616 (or 21614 counting only the distinct ones).

The product of its digits is 762048, while the sum is 49.

The spelling of 91271437492 in words is "ninety-one billion, two hundred seventy-one million, four hundred thirty-seven thousand, four hundred ninety-two".