2163938449 has 4 divisors (see below), whose sum is σ = 2291228964. Its totient is φ = 2036647936.

The previous prime is 2163938429. The next prime is 2163938453. The reversal of 2163938449 is 9448393612.

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 851180625 + 1312757824 = 29175^2 + 36232^2 .

It is a cyclic number.

It is not a de Polignac number, because 2163938449 - 2²⁹ = 1627067537 is a prime.

It is a super-2 number, since 2×2163938449² = 9365259222121051202, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2163938419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63645232 + ... + 63645265.

It is an arithmetic number, because the mean of its divisors is an integer number (572807241).

Almost surely, 2^2163938449 is an apocalyptic number.

It is an amenable number.

2163938449 is a deficient number, since it is larger than the sum of its proper divisors (127290515).

2163938449 is a wasteful number, since it uses less digits than its factorization.

2163938449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127290514.

The product of its digits is 1119744, while the sum is 49.

The square root of 2163938449 is about 46518.1518227025. The cubic root of 2163938449 is about 1293.4459972812.

The spelling of 2163938449 in words is "two billion, one hundred sixty-three million, nine hundred thirty-eight thousand, four hundred forty-nine".