91816272143 has 4 divisors (see below), whose sum is σ = 91816878168. Its totient is φ = 91815666120.

The previous prime is 91816272139. The next prime is 91816272151. The reversal of 91816272143 is 34127261819.

It is a Cunningham number, because it is equal to 303012²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 91816272143 - 2² = 91816272139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91816272094 and 91816272103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91816272103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151505 + ... + 454517.

It is an arithmetic number, because the mean of its divisors is an integer number (22954219542).

Almost surely, 2^91816272143 is an apocalyptic number.

91816272143 is a deficient number, since it is larger than the sum of its proper divisors (606025).

91816272143 is a wasteful number, since it uses less digits than its factorization.

91816272143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606024.

The product of its digits is 145152, while the sum is 44.

The spelling of 91816272143 in words is "ninety-one billion, eight hundred sixteen million, two hundred seventy-two thousand, one hundred forty-three".