91616998489 has 9 divisors (see below), whose sum is σ = 93394590079. Its totient is φ = 89872636360.

The previous prime is 91616998397. The next prime is 91616998511. The reversal of 91616998489 is 98489961619.

The square root of 91616998489 is 302683.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 66046430025 + 25570568464 = 256995^2 + 159908^2 .

It is not a de Polignac number, because 91616998489 - 2¹¹ = 91616996441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91616998189) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16039344 + ... + 16045054.

Almost surely, 2^91616998489 is an apocalyptic number.

91616998489 is the 302683-rd square number.

91616998489 is the 151342-nd centered octagonal number.

It is an amenable number.

91616998489 is a deficient number, since it is larger than the sum of its proper divisors (1777591590).

91616998489 is an frugal number, since it uses more digits than its factorization.

91616998489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11528 (or 5764 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 70.

The spelling of 91616998489 in words is "ninety-one billion, six hundred sixteen million, nine hundred ninety-eight thousand, four hundred eighty-nine".