2158881919 has 2 divisors, whose sum is σ = 2158881920. Its totient is φ = 2158881918.

The previous prime is 2158881917. The next prime is 2158881929. The reversal of 2158881919 is 9191888512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2158881919 - 2¹ = 2158881917 is a prime.

It is a super-2 number, since 2×2158881919² = 9321542280370245122, which contains 22 as substring.

Together with 2158881917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158881917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079440959 + 1079440960.

It is an arithmetic number, because the mean of its divisors is an integer number (1079440960).

Almost surely, 2^2158881919 is an apocalyptic number.

2158881919 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158881919 is an equidigital number, since it uses as much as digits as its factorization.

2158881919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 52.

The square root of 2158881919 is about 46463.7699611213. The cubic root of 2158881919 is about 1292.4377354784.

The spelling of 2158881919 in words is "two billion, one hundred fifty-eight million, eight hundred eighty-one thousand, nine hundred nineteen".