2145189885 has 32 divisors (see below), whose sum is σ = 3646650240. Its totient is φ = 1074786048.

The previous prime is 2145189881. The next prime is 2145189911. The reversal of 2145189885 is 5889815412.

It is not a de Polignac number, because 2145189885 - 2² = 2145189881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145189881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50547 + ... + 82736.

It is an arithmetic number, because the mean of its divisors is an integer number (113957820).

Almost surely, 2^2145189885 is an apocalyptic number.

It is an amenable number.

2145189885 is a deficient number, since it is larger than the sum of its proper divisors (1501460355).

2145189885 is a wasteful number, since it uses less digits than its factorization.

2145189885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133357.

The product of its digits is 921600, while the sum is 51.

The square root of 2145189885 is about 46316.1946299564. The cubic root of 2145189885 is about 1289.6996446330.

The spelling of 2145189885 in words is "two billion, one hundred forty-five million, one hundred eighty-nine thousand, eight hundred eighty-five".