91274177065 has 4 divisors (see below), whose sum is σ = 109529012484. Its totient is φ = 73019341648.

The previous prime is 91274177051. The next prime is 91274177101. The reversal of 91274177065 is 56077147219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56077147219 = 19 ⋅2951428801.

It can be written as a sum of positive squares in 2 ways, for example, as 23709532441 + 67564644624 = 153979^2 + 259932^2 .

It is a cyclic number.

It is not a de Polignac number, because 91274177065 - 2¹⁹ = 91273652777 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 9127417702 + ... + 9127417711.

It is an arithmetic number, because the mean of its divisors is an integer number (27382253121).

Almost surely, 2^91274177065 is an apocalyptic number.

It is an amenable number.

91274177065 is a deficient number, since it is larger than the sum of its proper divisors (18254835419).

91274177065 is a wasteful number, since it uses less digits than its factorization.

91274177065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18254835418.

The product of its (nonzero) digits is 740880, while the sum is 49.

The spelling of 91274177065 in words is "ninety-one billion, two hundred seventy-four million, one hundred seventy-seven thousand, sixty-five".