91516535289 has 15 divisors (see below), whose sum is σ = 136713953343. Its totient is φ = 61009208424.

The previous prime is 91516535221. The next prime is 91516535309. The reversal of 91516535289 is 98253561519.

The square root of 91516535289 is 302517.

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

91516535289 is a `hidden beast` number, since 9 + 1 + 51 + 65 + 3 + 528 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21560517225 + 69956018064 = 146835^2 + 264492^2 .

It is not a de Polignac number, because 91516535289 - 2¹⁵ = 91516502521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91516535219) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2705847 + ... + 2739459.

Almost surely, 2^91516535289 is an apocalyptic number.

91516535289 is the 302517-th square number.

91516535289 is the 151259-th centered octagonal number.

It is an amenable number.

91516535289 is a deficient number, since it is larger than the sum of its proper divisors (45197418054).

91516535289 is an frugal number, since it uses more digits than its factorization.

91516535289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67238 (or 33616 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 54.

The spelling of 91516535289 in words is "ninety-one billion, five hundred sixteen million, five hundred thirty-five thousand, two hundred eighty-nine".