91958691 has 16 divisors (see below), whose sum is σ = 133954560. Its totient is φ = 55650720.

The previous prime is 91958677. The next prime is 91958707. The reversal of 91958691 is 19685919.

It is not a de Polignac number, because 91958691 - 2¹⁰ = 91957667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91958691.

It is not an unprimeable number, because it can be changed into a prime (91958621) 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, 26865 + ... + 30093.

It is an arithmetic number, because the mean of its divisors is an integer number (8372160).

Almost surely, 2^91958691 is an apocalyptic number.

91958691 is a deficient number, since it is larger than the sum of its proper divisors (41995869).

91958691 is a wasteful number, since it uses less digits than its factorization.

91958691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106.

The product of its digits is 174960, while the sum is 48.

The square root of 91958691 is about 9589.5094243658. The cubic root of 91958691 is about 451.3681669136.

The spelling of 91958691 in words is "ninety-one million, nine hundred fifty-eight thousand, six hundred ninety-one".