2815188989 has 2 divisors, whose sum is σ = 2815188990. Its totient is φ = 2815188988.

The previous prime is 2815188947. The next prime is 2815188997. The reversal of 2815188989 is 9898815182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2261763364 + 553425625 = 47558^2 + 23525^2 .

It is a cyclic number.

It is not a de Polignac number, because 2815188989 - 2¹⁶ = 2815123453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2815128989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1407594494 + 1407594495.

It is an arithmetic number, because the mean of its divisors is an integer number (1407594495).

Almost surely, 2^2815188989 is an apocalyptic number.

It is an amenable number.

2815188989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2815188989 is an equidigital number, since it uses as much as digits as its factorization.

2815188989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 59.

The square root of 2815188989 is about 53058.3545636312. The cubic root of 2815188989 is about 1412.0037552364.

The spelling of 2815188989 in words is "two billion, eight hundred fifteen million, one hundred eighty-eight thousand, nine hundred eighty-nine".