2171875789 has 2 divisors, whose sum is σ = 2171875790. Its totient is φ = 2171875788.

The previous prime is 2171875759. The next prime is 2171875813. The reversal of 2171875789 is 9875781712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2170628100 + 1247689 = 46590^2 + 1117^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171875789 - 2⁵ = 2171875757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171875759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085937894 + 1085937895.

It is an arithmetic number, because the mean of its divisors is an integer number (1085937895).

Almost surely, 2^2171875789 is an apocalyptic number.

It is an amenable number.

2171875789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171875789 is an equidigital number, since it uses as much as digits as its factorization.

2171875789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1975680, while the sum is 55.

The square root of 2171875789 is about 46603.3881708187. The cubic root of 2171875789 is about 1295.0255236642.

The spelling of 2171875789 in words is "two billion, one hundred seventy-one million, eight hundred seventy-five thousand, seven hundred eighty-nine".