91213043233 has 4 divisors (see below), whose sum is σ = 98229431188. Its totient is φ = 84196655280.

The previous prime is 91213043231. The next prime is 91213043267. The reversal of 91213043233 is 33234031219.

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

It can be written as a sum of positive squares in 2 ways, for example, as 59290789009 + 31922254224 = 243497^2 + 178668^2 .

It is a cyclic number.

It is not a de Polignac number, because 91213043233 - 2¹ = 91213043231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91213043195 and 91213043204.

It is not an unprimeable number, because it can be changed into a prime (91213043231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3508193958 + ... + 3508193983.

It is an arithmetic number, because the mean of its divisors is an integer number (24557357797).

Almost surely, 2^91213043233 is an apocalyptic number.

It is an amenable number.

91213043233 is a deficient number, since it is larger than the sum of its proper divisors (7016387955).

91213043233 is a wasteful number, since it uses less digits than its factorization.

91213043233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7016387954.

The product of its (nonzero) digits is 11664, while the sum is 31.

The spelling of 91213043233 in words is "ninety-one billion, two hundred thirteen million, forty-three thousand, two hundred thirty-three".