91616990 has 16 divisors (see below), whose sum is σ = 165213648. Its totient is φ = 36579456.

The previous prime is 91616989. The next prime is 91617023. The reversal of 91616990 is 9961619.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2507 + ... + 13766.

It is an arithmetic number, because the mean of its divisors is an integer number (10325853).

Almost surely, 2^91616990 is an apocalyptic number.

91616990 is a deficient number, since it is larger than the sum of its proper divisors (73596658).

91616990 is a wasteful number, since it uses less digits than its factorization.

91616990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16843.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 91616990 is about 9571.6764466837. The cubic root of 91616990 is about 450.8084069420.

The spelling of 91616990 in words is "ninety-one million, six hundred sixteen thousand, nine hundred ninety".