91679969 has 4 divisors (see below), whose sum is σ = 94157844. Its totient is φ = 89202096.

The previous prime is 91679947. The next prime is 91679971. The reversal of 91679969 is 96997619.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88830625 + 2849344 = 9425^2 + 1688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91679969 is a prime.

It is a super-2 number, since 2×91679969² = 16810433431681922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91679069) 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, 1238882 + ... + 1238955.

It is an arithmetic number, because the mean of its divisors is an integer number (23539461).

Almost surely, 2^91679969 is an apocalyptic number.

It is an amenable number.

91679969 is a deficient number, since it is larger than the sum of its proper divisors (2477875).

91679969 is a wasteful number, since it uses less digits than its factorization.

91679969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2477874.

The product of its digits is 1653372, while the sum is 56.

The square root of 91679969 is about 9574.9657440640. The cubic root of 91679969 is about 450.9116809438.

The spelling of 91679969 in words is "ninety-one million, six hundred seventy-nine thousand, nine hundred sixty-nine".