91381886 has 8 divisors (see below), whose sum is σ = 137115264. Its totient is φ = 45676800.

The previous prime is 91381861. The next prime is 91381891. The reversal of 91381886 is 68818319.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5411 + ... + 14561.

It is an arithmetic number, because the mean of its divisors is an integer number (17139408).

Almost surely, 2^91381886 is an apocalyptic number.

91381886 is a deficient number, since it is larger than the sum of its proper divisors (45733378).

91381886 is a wasteful number, since it uses less digits than its factorization.

91381886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14146.

The product of its digits is 82944, while the sum is 44.

The square root of 91381886 is about 9559.3873234638. The cubic root of 91381886 is about 450.4224608820.

The spelling of 91381886 in words is "ninety-one million, three hundred eighty-one thousand, eight hundred eighty-six".