1080890891 has 2 divisors, whose sum is σ = 1080890892. Its totient is φ = 1080890890.

The previous prime is 1080890873. The next prime is 1080890893. The reversal of 1080890891 is 1980980801.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1980980801) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1680680801 and 1080860861.

It is a cyclic number.

It is not a de Polignac number, because 1080890891 - 2²⁶ = 1013782027 is a prime.

Together with 1080890893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1080890893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540445445 + 540445446.

It is an arithmetic number, because the mean of its divisors is an integer number (540445446).

Almost surely, 2^1080890891 is an apocalyptic number.

1080890891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1080890891 is an equidigital number, since it uses as much as digits as its factorization.

1080890891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 1080890891 is about 32876.9051311099. The cubic root of 1080890891 is about 1026.2676019854.

The spelling of 1080890891 in words is "one billion, eighty million, eight hundred ninety thousand, eight hundred ninety-one".