91000513331 has 16 divisors (see below), whose sum is σ = 112465391808. Its totient is φ = 71701632000.

The previous prime is 91000513297. The next prime is 91000513343. The reversal of 91000513331 is 13331500019.

It is a cyclic number.

It is not a de Polignac number, because 91000513331 - 2⁶ = 91000513267 is a prime.

It is a super-2 number, since 2×91000513331² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91000513331.

It is not an unprimeable number, because it can be changed into a prime (91000513391) 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, 2052770 + ... + 2096631.

It is an arithmetic number, because the mean of its divisors is an integer number (7029086988).

Almost surely, 2^91000513331 is an apocalyptic number.

91000513331 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

91000513331 is a deficient number, since it is larger than the sum of its proper divisors (21464878477).

91000513331 is a wasteful number, since it uses less digits than its factorization.

91000513331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4149662.

The product of its (nonzero) digits is 1215, while the sum is 26.

The spelling of 91000513331 in words is "ninety-one billion, five hundred thirteen thousand, three hundred thirty-one".