91637582089 has 9 divisors (see below), whose sum is σ = 92567401293. Its totient is φ = 90717019692.

The previous prime is 91637582033. The next prime is 91637582111. The reversal of 91637582089 is 98028573619.

The square root of 91637582089 is 302717.

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

It is not a de Polignac number, because 91637582089 - 2⁹ = 91637581577 is a prime.

It is a super-2 number, since 2×91637582089² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91637582989) 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, 31178382 + ... + 31181320.

Almost surely, 2^91637582089 is an apocalyptic number.

91637582089 is the 302717-th square number.

91637582089 is the 151359-th centered octagonal number.

It is an amenable number.

91637582089 is a deficient number, since it is larger than the sum of its proper divisors (929819204).

91637582089 is an frugal number, since it uses more digits than its factorization.

91637582089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6084 (or 3042 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 91637582089 in words is "ninety-one billion, six hundred thirty-seven million, five hundred eighty-two thousand, eighty-nine".