2164015989 has 12 divisors (see below), whose sum is σ = 3233587500. Its totient is φ = 1392929664.

The previous prime is 2164015981. The next prime is 2164016011. The reversal of 2164015989 is 9895104612.

2164015989 is a `hidden beast` number, since 2 + 16 + 40 + 1 + 598 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 447322500 + 1716693489 = 21150^2 + 41433^2 .

It is not a de Polignac number, because 2164015989 - 2³ = 2164015981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164015981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4145364 + ... + 4145885.

It is an arithmetic number, because the mean of its divisors is an integer number (269465625).

Almost surely, 2^2164015989 is an apocalyptic number.

2164015989 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2164015989 is a deficient number, since it is larger than the sum of its proper divisors (1069571511).

2164015989 is a wasteful number, since it uses less digits than its factorization.

2164015989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8291284 (or 8291281 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 2164015989 is about 46518.9852533350. The cubic root of 2164015989 is about 1293.4614463658.

The spelling of 2164015989 in words is "two billion, one hundred sixty-four million, fifteen thousand, nine hundred eighty-nine".