91143022243231 has 4 divisors (see below), whose sum is σ = 104163453992272. Its totient is φ = 78122590494192.

The previous prime is 91143022243219. The next prime is 91143022243249. The reversal of 91143022243231 is 13234222034119.

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 91143022243231 - 2²⁵ = 91142988688799 is a prime.

It is a super-4 number, since 4×91143022243231⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91143022243291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6510215874510 + ... + 6510215874523.

It is an arithmetic number, because the mean of its divisors is an integer number (26040863498068).

Almost surely, 2^{91143022243231} is an apocalyptic number.

91143022243231 is a deficient number, since it is larger than the sum of its proper divisors (13020431749041).

91143022243231 is a wasteful number, since it uses less digits than its factorization.

91143022243231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13020431749040.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 91143022243231 in words is "ninety-one trillion, one hundred forty-three billion, twenty-two million, two hundred forty-three thousand, two hundred thirty-one".