2164345889 has 4 divisors (see below), whose sum is σ = 2164439940. Its totient is φ = 2164251840.

The previous prime is 2164345873. The next prime is 2164345913. The reversal of 2164345889 is 9885434612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1771989025 + 392356864 = 42095^2 + 19808^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164345889 - 2⁴ = 2164345873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2164315889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13229 + ... + 67109.

It is an arithmetic number, because the mean of its divisors is an integer number (541109985).

Almost surely, 2^2164345889 is an apocalyptic number.

It is an amenable number.

2164345889 is a deficient number, since it is larger than the sum of its proper divisors (94051).

2164345889 is an equidigital number, since it uses as much as digits as its factorization.

2164345889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94050.

The product of its digits is 1658880, while the sum is 50.

The square root of 2164345889 is about 46522.5309823101. The cubic root of 2164345889 is about 1293.5271715809.

The spelling of 2164345889 in words is "two billion, one hundred sixty-four million, three hundred forty-five thousand, eight hundred eighty-nine".