91699493 has 4 divisors (see below), whose sum is σ = 93936108. Its totient is φ = 89462880.

The previous prime is 91699469. The next prime is 91699507. The reversal of 91699493 is 39499619.

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 15626209 + 76073284 = 3953^2 + 8722^2 .

It is a cyclic number.

It is not a de Polignac number, because 91699493 - 2²² = 87505189 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 (91699403) 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, 1118246 + ... + 1118327.

It is an arithmetic number, because the mean of its divisors is an integer number (23484027).

Almost surely, 2^91699493 is an apocalyptic number.

It is an amenable number.

91699493 is a deficient number, since it is larger than the sum of its proper divisors (2236615).

91699493 is a wasteful number, since it uses less digits than its factorization.

91699493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236614.

The product of its digits is 472392, while the sum is 50.

The square root of 91699493 is about 9575.9852234640. The cubic root of 91699493 is about 450.9436871166.

The spelling of 91699493 in words is "ninety-one million, six hundred ninety-nine thousand, four hundred ninety-three".