91921874 has 16 divisors (see below), whose sum is σ = 153917280. Its totient is φ = 40810560.

The previous prime is 91921871. The next prime is 91921889. The reversal of 91921874 is 47812919.

It is not an unprimeable number, because it can be changed into a prime (91921871) 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, 47639 + ... + 49530.

It is an arithmetic number, because the mean of its divisors is an integer number (9619830).

Almost surely, 2^91921874 is an apocalyptic number.

91921874 is a deficient number, since it is larger than the sum of its proper divisors (61995406).

91921874 is a wasteful number, since it uses less digits than its factorization.

91921874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97225.

The product of its digits is 36288, while the sum is 41.

The square root of 91921874 is about 9587.5895823716. The cubic root of 91921874 is about 451.3079216017.

The spelling of 91921874 in words is "ninety-one million, nine hundred twenty-one thousand, eight hundred seventy-four".