91166631 has 16 divisors (see below), whose sum is σ = 132187104. Its totient is φ = 55655424.

The previous prime is 91166591. The next prime is 91166651. The reversal of 91166631 is 13666119.

It is not a de Polignac number, because 91166631 - 2¹⁷ = 91035559 is a prime.

It is a super-2 number, since 2×91166631² = 16622709215780322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91166592 and 91166601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91166651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22270 + ... + 26043.

It is an arithmetic number, because the mean of its divisors is an integer number (8261694).

Almost surely, 2^91166631 is an apocalyptic number.

91166631 is a deficient number, since it is larger than the sum of its proper divisors (41020473).

91166631 is a wasteful number, since it uses less digits than its factorization.

91166631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48370.

The product of its digits is 5832, while the sum is 33.

The square root of 91166631 is about 9548.1218572031. The cubic root of 91166631 is about 450.0685179618.

The spelling of 91166631 in words is "ninety-one million, one hundred sixty-six thousand, six hundred thirty-one".