91271558843 has 4 divisors (see below), whose sum is σ = 92767813968. Its totient is φ = 89775303720.

The previous prime is 91271558839. The next prime is 91271558879. The reversal of 91271558843 is 34885517219.

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 91271558843 - 2² = 91271558839 is a prime.

It is a super-2 number, since 2×91271558843² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91271558803) 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 3 ways as a sum of consecutive naturals, for example, 748127471 + ... + 748127592.

It is an arithmetic number, because the mean of its divisors is an integer number (23191953492).

Almost surely, 2^91271558843 is an apocalyptic number.

91271558843 is a deficient number, since it is larger than the sum of its proper divisors (1496255125).

91271558843 is a wasteful number, since it uses less digits than its factorization.

91271558843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496255124.

The product of its digits is 2419200, while the sum is 53.

The spelling of 91271558843 in words is "ninety-one billion, two hundred seventy-one million, five hundred fifty-eight thousand, eight hundred forty-three".