91355240031 has 16 divisors (see below), whose sum is σ = 133083872640. Its totient is φ = 55282010720.

The previous prime is 91355240021. The next prime is 91355240063. The reversal of 91355240031 is 13004255319.

It is a cyclic number.

It is not a de Polignac number, because 91355240031 - 2¹¹ = 91355237983 is a prime.

It is a super-2 number, since 2×91355240031² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 91355239974 and 91355240001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91355240021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2098161 + ... + 2141258.

It is an arithmetic number, because the mean of its divisors is an integer number (8317742040).

Almost surely, 2^91355240031 is an apocalyptic number.

91355240031 is a deficient number, since it is larger than the sum of its proper divisors (41728632609).

91355240031 is a wasteful number, since it uses less digits than its factorization.

91355240031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240086.

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 91355240031 in words is "ninety-one billion, three hundred fifty-five million, two hundred forty thousand, thirty-one".