2138961249 has 20 divisors (see below), whose sum is σ = 3215609364. Its totient is φ = 1416883104.

The previous prime is 2138961241. The next prime is 2138961257. The reversal of 2138961249 is 9421698312.

2138961249 is a `hidden beast` number, since 21 + 3 + 8 + 9 + 612 + 4 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (2138961241) and next prime (2138961257).

It can be written as a sum of positive squares in 2 ways, for example, as 1228853025 + 910108224 = 35055^2 + 30168^2 .

It is not a de Polignac number, because 2138961249 - 2³ = 2138961241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2138961241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 71382 + ... + 96815.

Almost surely, 2^2138961249 is an apocalyptic number.

It is an amenable number.

2138961249 is a deficient number, since it is larger than the sum of its proper divisors (1076648115).

2138961249 is a wasteful number, since it uses less digits than its factorization.

2138961249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168366 (or 168357 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 2138961249 is about 46248.9053816412. The cubic root of 2138961249 is about 1288.4502048163.

The spelling of 2138961249 in words is "two billion, one hundred thirty-eight million, nine hundred sixty-one thousand, two hundred forty-nine".