91716890 has 8 divisors (see below), whose sum is σ = 165090420. Its totient is φ = 36686752.

The previous prime is 91716883. The next prime is 91716907. The reversal of 91716890 is 9861719.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 85729081 + 5987809 = 9259^2 + 2447^2 .

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

It is a super-2 number, since 2×91716890² = 16823975822544200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4585835 + ... + 4585854.

Almost surely, 2^91716890 is an apocalyptic number.

91716890 is a deficient number, since it is larger than the sum of its proper divisors (73373530).

91716890 is a wasteful number, since it uses less digits than its factorization.

91716890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9171696.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 91716890 is about 9576.8935464481. The cubic root of 91716890 is about 450.9722026187.

It can be divided in two parts, 9171 and 6890, that added together give a palindrome (16061).

The spelling of 91716890 in words is "ninety-one million, seven hundred sixteen thousand, eight hundred ninety".