91326653209 has 27 divisors (see below), whose sum is σ = 101915757237. Its totient is φ = 81776131800.

The previous prime is 91326653191. The next prime is 91326653213. The reversal of 91326653209 is 90235662319.

The square root of 91326653209 is 302203.

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

It is not a de Polignac number, because 91326653209 - 2⁵ = 91326653177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91326653279) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 275911174 + ... + 275911504.

Almost surely, 2^91326653209 is an apocalyptic number.

91326653209 is the 302203-rd square number.

91326653209 is the 151102-nd centered octagonal number.

It is an amenable number.

91326653209 is a deficient number, since it is larger than the sum of its proper divisors (10589104028).

91326653209 is an frugal number, since it uses more digits than its factorization.

91326653209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 46.

The spelling of 91326653209 in words is "ninety-one billion, three hundred twenty-six million, six hundred fifty-three thousand, two hundred nine".