2188039509 has 6 divisors (see below), whose sum is σ = 3160501526. Its totient is φ = 1458693000.

The previous prime is 2188039501. The next prime is 2188039549. The reversal of 2188039509 is 9059308812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2113700625 + 74338884 = 45975^2 + 8622^2 .

It is not a de Polignac number, because 2188039509 - 2³ = 2188039501 is a prime.

It is a super-2 number, since 2×2188039509² = 9575033785889922162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188039501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121557742 + ... + 121557759.

Almost surely, 2^2188039509 is an apocalyptic number.

It is an amenable number.

2188039509 is a deficient number, since it is larger than the sum of its proper divisors (972462017).

2188039509 is a wasteful number, since it uses less digits than its factorization.

2188039509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243115507 (or 243115504 counting only the distinct ones).

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

The square root of 2188039509 is about 46776.4845729133. The cubic root of 2188039509 is about 1298.2302365876.

The spelling of 2188039509 in words is "two billion, one hundred eighty-eight million, thirty-nine thousand, five hundred nine".