91986931 has 8 divisors (see below), whose sum is σ = 93466880. Its totient is φ = 90518472.

The previous prime is 91986911. The next prime is 91986967. The reversal of 91986931 is 13968919.

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

It is a cyclic number.

It is not a de Polignac number, because 91986931 - 2⁵ = 91986899 is a prime.

It is a super-2 number, since 2×91986931² = 16923190949597522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91986901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14050 + ... + 19528.

It is an arithmetic number, because the mean of its divisors is an integer number (11683360).

Almost surely, 2^91986931 is an apocalyptic number.

91986931 is a deficient number, since it is larger than the sum of its proper divisors (1479949).

91986931 is a wasteful number, since it uses less digits than its factorization.

91986931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5745.

The product of its digits is 104976, while the sum is 46.

The square root of 91986931 is about 9590.9817537101. The cubic root of 91986931 is about 451.4143663984.

It can be divided in two parts, 9198 and 6931, that added together give a square (16129 = 127²).

The spelling of 91986931 in words is "ninety-one million, nine hundred eighty-six thousand, nine hundred thirty-one".