91577191121 has 4 divisors (see below), whose sum is σ = 98621590452. Its totient is φ = 84532791792.

The previous prime is 91577191099. The next prime is 91577191157. The reversal of 91577191121 is 12119177519.

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 43313934400 + 48263256721 = 208120^2 + 219689^2 .

It is a cyclic number.

It is not a de Polignac number, because 91577191121 - 2¹⁴ = 91577174737 is a prime.

It is a super-2 number, since 2×91577191121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91577191921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3522199646 + ... + 3522199671.

It is an arithmetic number, because the mean of its divisors is an integer number (24655397613).

Almost surely, 2^91577191121 is an apocalyptic number.

It is an amenable number.

91577191121 is a deficient number, since it is larger than the sum of its proper divisors (7044399331).

91577191121 is a wasteful number, since it uses less digits than its factorization.

91577191121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044399330.

The product of its digits is 39690, while the sum is 44.

The spelling of 91577191121 in words is "ninety-one billion, five hundred seventy-seven million, one hundred ninety-one thousand, one hundred twenty-one".