91805161031223 has 4 divisors (see below), whose sum is σ = 122406881374968. Its totient is φ = 61203440687480.

The previous prime is 91805161031179. The next prime is 91805161031317. The reversal of 91805161031223 is 32213016150819.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91805161031223 - 2⁸ = 91805161030967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91805161036223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15300860171868 + ... + 15300860171873.

It is an arithmetic number, because the mean of its divisors is an integer number (30601720343742).

Almost surely, 2^{91805161031223} is an apocalyptic number.

91805161031223 is a deficient number, since it is larger than the sum of its proper divisors (30601720343745).

91805161031223 is a wasteful number, since it uses less digits than its factorization.

91805161031223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30601720343744.

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 91805161031223 in words is "ninety-one trillion, eight hundred five billion, one hundred sixty-one million, thirty-one thousand, two hundred twenty-three".