91291473 has 24 divisors (see below), whose sum is σ = 162297408. Its totient is φ = 48153312.

The previous prime is 91291463. The next prime is 91291477. The reversal of 91291473 is 37419219.

It is not a de Polignac number, because 91291473 - 2²⁰ = 90242897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91291477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54915 + ... + 56552.

It is an arithmetic number, because the mean of its divisors is an integer number (6762392).

Almost surely, 2^91291473 is an apocalyptic number.

It is an amenable number.

91291473 is a deficient number, since it is larger than the sum of its proper divisors (71005935).

91291473 is a wasteful number, since it uses less digits than its factorization.

91291473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111493 (or 111490 counting only the distinct ones).

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

The square root of 91291473 is about 9554.6571367056. The cubic root of 91291473 is about 450.2738629271.

The spelling of 91291473 in words is "ninety-one million, two hundred ninety-one thousand, four hundred seventy-three".