91316731 has 8 divisors (see below), whose sum is σ = 102832128. Its totient is φ = 80337000.

The previous prime is 91316699. The next prime is 91316747. The reversal of 91316731 is 13761319.

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 91316731 - 2⁵ = 91316699 is a prime.

It is a super-2 number, since 2×91316731² = 16677490721052722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91316693 and 91316702.

It is not an unprimeable number, because it can be changed into a prime (91314731) 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, 133555 + ... + 134236.

It is an arithmetic number, because the mean of its divisors is an integer number (12854016).

Almost surely, 2^91316731 is an apocalyptic number.

91316731 is a deficient number, since it is larger than the sum of its proper divisors (11515397).

91316731 is a wasteful number, since it uses less digits than its factorization.

91316731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267833.

The product of its digits is 3402, while the sum is 31.

The square root of 91316731 is about 9555.9788091017. The cubic root of 91316731 is about 450.3153854927.

The spelling of 91316731 in words is "ninety-one million, three hundred sixteen thousand, seven hundred thirty-one".