91616998490 has 16 divisors (see below), whose sum is σ = 164952010440. Its totient is φ = 36637596480.

The previous prime is 91616998397. The next prime is 91616998511. The reversal of 91616998490 is 9489961619.

It is a happy number.

It is a Cunningham number, because it is equal to 302683²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 88981100209 + 2635898281 = 298297^2 + 51341^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1108481 + ... + 1188260.

Almost surely, 2^91616998490 is an apocalyptic number.

91616998490 is a deficient number, since it is larger than the sum of its proper divisors (73335011950).

91616998490 is a wasteful number, since it uses less digits than its factorization.

91616998490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300737.

The product of its (nonzero) digits is 7558272, while the sum is 62.

The spelling of 91616998490 in words is "ninety-one billion, six hundred sixteen million, nine hundred ninety-eight thousand, four hundred ninety".