91694809 has 2 divisors, whose sum is σ = 91694810. Its totient is φ = 91694808.

The previous prime is 91694797. The next prime is 91694849. The reversal of 91694809 is 90849619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90782784 + 912025 = 9528^2 + 955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91694809 is a prime.

It is not a weakly prime, because it can be changed into another prime (91694849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45847404 + 45847405.

It is an arithmetic number, because the mean of its divisors is an integer number (45847405).

Almost surely, 2^91694809 is an apocalyptic number.

It is an amenable number.

91694809 is a deficient number, since it is larger than the sum of its proper divisors (1).

91694809 is an equidigital number, since it uses as much as digits as its factorization.

91694809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 91694809 is about 9575.7406502056. The cubic root of 91694809 is about 450.9360089346.

The spelling of 91694809 in words is "ninety-one million, six hundred ninety-four thousand, eight hundred nine".