91044113531 has 32 divisors (see below), whose sum is σ = 110382912000. Its totient is φ = 73353772800.

The previous prime is 91044113519. The next prime is 91044113533. The reversal of 91044113531 is 13531144019.

It is not a de Polignac number, because 91044113531 - 2⁶ = 91044113467 is a prime.

It is a super-2 number, since 2×91044113531² (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 (91044113533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23639756 + ... + 23643606.

It is an arithmetic number, because the mean of its divisors is an integer number (3449466000).

Almost surely, 2^91044113531 is an apocalyptic number.

91044113531 is a deficient number, since it is larger than the sum of its proper divisors (19338798469).

91044113531 is a wasteful number, since it uses less digits than its factorization.

91044113531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5219.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 91044113531 in words is "ninety-one billion, forty-four million, one hundred thirteen thousand, five hundred thirty-one".