2187913689 has 12 divisors (see below), whose sum is σ = 3403421476. Its totient is φ = 1346408352.

The previous prime is 2187913643. The next prime is 2187913747. The reversal of 2187913689 is 9863197812.

It can be written as a sum of positive squares in 2 ways, for example, as 629006400 + 1558907289 = 25080^2 + 39483^2 .

It is not a de Polignac number, because 2187913689 - 2⁹ = 2187913177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2187912689) 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, 9349942 + ... + 9350175.

Almost surely, 2^2187913689 is an apocalyptic number.

It is an amenable number.

2187913689 is a deficient number, since it is larger than the sum of its proper divisors (1215507787).

2187913689 is a wasteful number, since it uses less digits than its factorization.

2187913689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18700136 (or 18700133 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 2187913689 is about 46775.1396470390. The cubic root of 2187913689 is about 1298.2053518359.

The spelling of 2187913689 in words is "two billion, one hundred eighty-seven million, nine hundred thirteen thousand, six hundred eighty-nine".