2115638449 has 4 divisors (see below), whose sum is σ = 2116619620. Its totient is φ = 2114657280.

The previous prime is 2115638383. The next prime is 2115638453. The reversal of 2115638449 is 9448365112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1599440049 + 516198400 = 39993^2 + 22720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115638449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115638489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487344 + ... + 491665.

It is an arithmetic number, because the mean of its divisors is an integer number (529154905).

Almost surely, 2^2115638449 is an apocalyptic number.

It is an amenable number.

2115638449 is a deficient number, since it is larger than the sum of its proper divisors (981171).

2115638449 is an equidigital number, since it uses as much as digits as its factorization.

2115638449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981170.

The product of its digits is 207360, while the sum is 43.

The square root of 2115638449 is about 45996.0699299408. The cubic root of 2115638449 is about 1283.7500801501.

The spelling of 2115638449 in words is "two billion, one hundred fifteen million, six hundred thirty-eight thousand, four hundred forty-nine".