91861386 has 32 divisors (see below), whose sum is σ = 191600640. Its totient is φ = 29324736.

The previous prime is 91861369. The next prime is 91861403. The reversal of 91861386 is 68316819.

It is an interprime number because it is at equal distance from previous prime (91861369) and next prime (91861403).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20020 + ... + 24176.

It is an arithmetic number, because the mean of its divisors is an integer number (5987520).

Almost surely, 2^91861386 is an apocalyptic number.

91861386 is an abundant number, since it is smaller than the sum of its proper divisors (99739254).

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

91861386 is a wasteful number, since it uses less digits than its factorization.

91861386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318.

The product of its digits is 62208, while the sum is 42.

The square root of 91861386 is about 9584.4345686118. The cubic root of 91861386 is about 451.2089074338.

The spelling of 91861386 in words is "ninety-one million, eight hundred sixty-one thousand, three hundred eighty-six".