2170138889 has 2 divisors, whose sum is σ = 2170138890. Its totient is φ = 2170138888.

The previous prime is 2170138877. The next prime is 2170138891. The reversal of 2170138889 is 9888310712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1750585600 + 419553289 = 41840^2 + 20483^2 .

It is a cyclic number.

It is not a de Polignac number, because 2170138889 - 2²⁴ = 2153361673 is a prime.

Together with 2170138891, 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 (2170138819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085069444 + 1085069445.

It is an arithmetic number, because the mean of its divisors is an integer number (1085069445).

Almost surely, 2^2170138889 is an apocalyptic number.

It is an amenable number.

2170138889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170138889 is an equidigital number, since it uses as much as digits as its factorization.

2170138889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 2170138889 is about 46584.7495324382. The cubic root of 2170138889 is about 1294.6802108362.

The spelling of 2170138889 in words is "two billion, one hundred seventy million, one hundred thirty-eight thousand, eight hundred eighty-nine".