91312112020201 has 4 divisors (see below), whose sum is σ = 93034982058372. Its totient is φ = 89589241982032.

The previous prime is 91312112020193. The next prime is 91312112020211. The reversal of 91312112020201 is 10202021121319.

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 45428287482601 + 45883824537600 = 6740051^2 + 6773760^2 .

It is a cyclic number.

It is not a de Polignac number, because 91312112020201 - 2³ = 91312112020193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91312112020211) 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, 861435019006 + ... + 861435019111.

It is an arithmetic number, because the mean of its divisors is an integer number (23258745514593).

Almost surely, 2^{91312112020201} is an apocalyptic number.

It is an amenable number.

91312112020201 is a deficient number, since it is larger than the sum of its proper divisors (1722870038171).

91312112020201 is a wasteful number, since it uses less digits than its factorization.

91312112020201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722870038170.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 91312112020201 in words is "ninety-one trillion, three hundred twelve billion, one hundred twelve million, twenty thousand, two hundred one".