91987194 has 16 divisors (see below), whose sum is σ = 198126432. Its totient is φ = 28303728.

The previous prime is 91987193. The next prime is 91987201. The reversal of 91987194 is 49178919.

It is not an unprimeable number, because it can be changed into a prime (91987193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589584 + ... + 589739.

It is an arithmetic number, because the mean of its divisors is an integer number (12382902).

Almost surely, 2^91987194 is an apocalyptic number.

91987194 is an abundant number, since it is smaller than the sum of its proper divisors (106139238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91987194 is a wasteful number, since it uses less digits than its factorization.

91987194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179341.

The product of its digits is 163296, while the sum is 48.

The square root of 91987194 is about 9590.9954644969. The cubic root of 91987194 is about 451.4147966112.

The spelling of 91987194 in words is "ninety-one million, nine hundred eighty-seven thousand, one hundred ninety-four".