91031697 has 6 divisors (see below), whose sum is σ = 131490242. Its totient is φ = 60687792.

The previous prime is 91031683. The next prime is 91031701. The reversal of 91031697 is 79613019.

It can be written as a sum of positive squares in only one way, i.e., 80299521 + 10732176 = 8961^2 + 3276^2 .

It is not a de Polignac number, because 91031697 - 2¹⁴ = 91015313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91031197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5057308 + ... + 5057325.

Almost surely, 2^91031697 is an apocalyptic number.

It is an amenable number.

91031697 is a deficient number, since it is larger than the sum of its proper divisors (40458545).

91031697 is a wasteful number, since it uses less digits than its factorization.

91031697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10114639 (or 10114636 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 91031697 is about 9541.0532437462. The cubic root of 91031697 is about 449.8463623663.

The spelling of 91031697 in words is "ninety-one million, thirty-one thousand, six hundred ninety-seven".