91890253316 has 12 divisors (see below), whose sum is σ = 161356777932. Its totient is φ = 45788316768.

The previous prime is 91890253309. The next prime is 91890253349. The reversal of 91890253316 is 61335209819.

It can be written as a sum of positive squares in 2 ways, for example, as 40038409216 + 51851844100 = 200096^2 + 227710^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39201155 + ... + 39203498.

It is an arithmetic number, because the mean of its divisors is an integer number (13446398161).

Almost surely, 2^91890253316 is an apocalyptic number.

It is an amenable number.

91890253316 is a deficient number, since it is larger than the sum of its proper divisors (69466524616).

91890253316 is a wasteful number, since it uses less digits than its factorization.

91890253316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78404950 (or 78404948 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 91890253316 in words is "ninety-one billion, eight hundred ninety million, two hundred fifty-three thousand, three hundred sixteen".