91906331 has 8 divisors (see below), whose sum is σ = 100374528. Its totient is φ = 83457000.

The previous prime is 91906277. The next prime is 91906333. The reversal of 91906331 is 13360919.

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

It is not a de Polignac number, because 91906331 - 2²⁶ = 24797467 is a prime.

It is a super-2 number, since 2×91906331² = 16893547355763122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91906333) 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, 6686 + ... + 15116.

It is an arithmetic number, because the mean of its divisors is an integer number (12546816).

Almost surely, 2^91906331 is an apocalyptic number.

91906331 is a deficient number, since it is larger than the sum of its proper divisors (8468197).

91906331 is a wasteful number, since it uses less digits than its factorization.

91906331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9433.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 91906331 is about 9586.7789689760. The cubic root of 91906331 is about 451.2824830631.

The spelling of 91906331 in words is "ninety-one million, nine hundred six thousand, three hundred thirty-one".