91577481131 has 4 divisors (see below), whose sum is σ = 92387901432. Its totient is φ = 90767060832.

The previous prime is 91577481091. The next prime is 91577481137. The reversal of 91577481131 is 13118477519.

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

It is a cyclic number.

It is not a de Polignac number, because 91577481131 - 2¹⁰ = 91577480107 is a prime.

It is a super-2 number, since 2×91577481131² (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 (91577481137) 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, 405209981 + ... + 405210206.

It is an arithmetic number, because the mean of its divisors is an integer number (23096975358).

Almost surely, 2^91577481131 is an apocalyptic number.

91577481131 is a deficient number, since it is larger than the sum of its proper divisors (810420301).

91577481131 is a wasteful number, since it uses less digits than its factorization.

91577481131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810420300.

The product of its digits is 211680, while the sum is 47.

The spelling of 91577481131 in words is "ninety-one billion, five hundred seventy-seven million, four hundred eighty-one thousand, one hundred thirty-one".