91026980891 has 8 divisors (see below), whose sum is σ = 113488184064. Its totient is φ = 70930114920.

The previous prime is 91026980843. The next prime is 91026980893. The reversal of 91026980891 is 19808962019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91026980891 - 2¹⁰ = 91026979867 is a prime.

It is a super-2 number, since 2×91026980891² (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 (91026980893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591084215 + ... + 591084368.

It is an arithmetic number, because the mean of its divisors is an integer number (14186023008).

Almost surely, 2^91026980891 is an apocalyptic number.

91026980891 is a deficient number, since it is larger than the sum of its proper divisors (22461203173).

91026980891 is a wasteful number, since it uses less digits than its factorization.

91026980891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182168601.

The product of its (nonzero) digits is 559872, while the sum is 53.

The spelling of 91026980891 in words is "ninety-one billion, twenty-six million, nine hundred eighty thousand, eight hundred ninety-one".