91481923 has 4 divisors (see below), whose sum is σ = 98519008. Its totient is φ = 84444840.

The previous prime is 91481911. The next prime is 91481927. The reversal of 91481923 is 32918419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32918419 = 37 ⋅889687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91481923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91481927) 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, 3518523 + ... + 3518548.

It is an arithmetic number, because the mean of its divisors is an integer number (24629752).

Almost surely, 2^91481923 is an apocalyptic number.

91481923 is a deficient number, since it is larger than the sum of its proper divisors (7037085).

91481923 is a wasteful number, since it uses less digits than its factorization.

91481923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037084.

The product of its digits is 15552, while the sum is 37.

The square root of 91481923 is about 9564.6182882538. The cubic root of 91481923 is about 450.5867621510.

The spelling of 91481923 in words is "ninety-one million, four hundred eighty-one thousand, nine hundred twenty-three".