91965404161 has 4 divisors (see below), whose sum is σ = 93225204292. Its totient is φ = 90705604032.

The previous prime is 91965404087. The next prime is 91965404173. The reversal of 91965404161 is 16140456919.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72404584561 + 19560819600 = 269081^2 + 139860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91965404161 is a prime.

It is a super-3 number, since 3×91965404161³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91965402161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629899956 + ... + 629900101.

It is an arithmetic number, because the mean of its divisors is an integer number (23306301073).

Almost surely, 2^91965404161 is an apocalyptic number.

It is an amenable number.

91965404161 is a deficient number, since it is larger than the sum of its proper divisors (1259800131).

91965404161 is a wasteful number, since it uses less digits than its factorization.

91965404161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259800130.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 91965404161 in words is "ninety-one billion, nine hundred sixty-five million, four hundred four thousand, one hundred sixty-one".