91081090131 has 16 divisors (see below), whose sum is σ = 126792601344. Its totient is φ = 58048114784.

The previous prime is 91081090129. The next prime is 91081090147. The reversal of 91081090131 is 13109018019.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91081090131 - 2¹ = 91081090129 is a prime.

It is a super-2 number, since 2×91081090131² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91081090092 and 91081090101.

It is not an unprimeable number, because it can be changed into a prime (91081090181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246036 + ... + 492641.

It is an arithmetic number, because the mean of its divisors is an integer number (7924537584).

Almost surely, 2^91081090131 is an apocalyptic number.

91081090131 is a deficient number, since it is larger than the sum of its proper divisors (35711511213).

91081090131 is a wasteful number, since it uses less digits than its factorization.

91081090131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740490.

The product of its (nonzero) digits is 1944, while the sum is 33.

The spelling of 91081090131 in words is "ninety-one billion, eighty-one million, ninety thousand, one hundred thirty-one".