91156052645 has 18 divisors (see below), whose sum is σ = 127253005362. Its totient is φ = 62503766976.

The previous prime is 91156052641. The next prime is 91156052657. The reversal of 91156052645 is 54625065119.

It can be written as a sum of positive squares in 3 ways, for example, as 22730386756 + 68425665889 = 150766^2 + 261583^2 .

It is not a de Polignac number, because 91156052645 - 2² = 91156052641 is a prime.

It is a super-2 number, since 2×91156052645² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91156052596 and 91156052605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91156052641) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4716161 + ... + 4735449.

It is an arithmetic number, because the mean of its divisors is an integer number (7069611409).

Almost surely, 2^91156052645 is an apocalyptic number.

It is an amenable number.

91156052645 is a deficient number, since it is larger than the sum of its proper divisors (36096952717).

91156052645 is an frugal number, since it uses more digits than its factorization.

91156052645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38597 (or 19301 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 91156052645 in words is "ninety-one billion, one hundred fifty-six million, fifty-two thousand, six hundred forty-five".