91694731 has 4 divisors (see below), whose sum is σ = 91714312. Its totient is φ = 91675152.

The previous prime is 91694699. The next prime is 91694761. The reversal of 91694731 is 13749619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13749619 = 13 ⋅1057663.

It is a cyclic number.

It is not a de Polignac number, because 91694731 - 2⁵ = 91694699 is a prime.

It is a super-2 number, since 2×91694731² = 16815847386324722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91694761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1840 + ... + 13666.

It is an arithmetic number, because the mean of its divisors is an integer number (22928578).

Almost surely, 2^91694731 is an apocalyptic number.

91694731 is a deficient number, since it is larger than the sum of its proper divisors (19581).

91694731 is a wasteful number, since it uses less digits than its factorization.

91694731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19580.

The product of its digits is 40824, while the sum is 40.

The square root of 91694731 is about 9575.7365774127. The cubic root of 91694731 is about 450.9358810720.

The spelling of 91694731 in words is "ninety-one million, six hundred ninety-four thousand, seven hundred thirty-one".