91942491 has 16 divisors (see below), whose sum is σ = 124761600. Its totient is φ = 60217248.

The previous prime is 91942489. The next prime is 91942507. The reversal of 91942491 is 19424919.

It is not a de Polignac number, because 91942491 - 2¹ = 91942489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91942451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52945 + ... + 54653.

It is an arithmetic number, because the mean of its divisors is an integer number (7797600).

Almost surely, 2^91942491 is an apocalyptic number.

91942491 is a deficient number, since it is larger than the sum of its proper divisors (32819109).

91942491 is a wasteful number, since it uses less digits than its factorization.

91942491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018.

The product of its digits is 23328, while the sum is 39.

The square root of 91942491 is about 9588.6647141299. The cubic root of 91942491 is about 451.3416601069.

The spelling of 91942491 in words is "ninety-one million, nine hundred forty-two thousand, four hundred ninety-one".