91699717 has 8 divisors (see below), whose sum is σ = 97805016. Its totient is φ = 85673472.

The previous prime is 91699703. The next prime is 91699723. The reversal of 91699717 is 71799619.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 57289761 + 34409956 = 7569^2 + 5866^2 .

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

It is not a de Polignac number, because 91699717 - 2¹⁹ = 91175429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91699787) 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, 17358 + ... + 22015.

It is an arithmetic number, because the mean of its divisors is an integer number (12225627).

Almost surely, 2^91699717 is an apocalyptic number.

It is an amenable number.

91699717 is a deficient number, since it is larger than the sum of its proper divisors (6105299).

91699717 is a wasteful number, since it uses less digits than its factorization.

91699717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39527.

The product of its digits is 214326, while the sum is 49.

The square root of 91699717 is about 9575.9969193813. The cubic root of 91699717 is about 450.9440542990.

It can be divided in two parts, 91699 and 717, that added together give a square (92416 = 304²).

The spelling of 91699717 in words is "ninety-one million, six hundred ninety-nine thousand, seven hundred seventeen".