2638639049 has 2 divisors, whose sum is σ = 2638639050. Its totient is φ = 2638639048.

The previous prime is 2638639033. The next prime is 2638639099. The reversal of 2638639049 is 9409368362.

It is an a-pointer prime, because the next prime (2638639099) can be obtained adding 2638639049 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2103873424 + 534765625 = 45868^2 + 23125^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638639049 - 2⁴ = 2638639033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2638638988 and 2638639006.

It is not a weakly prime, because it can be changed into another prime (2638639019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319319524 + 1319319525.

It is an arithmetic number, because the mean of its divisors is an integer number (1319319525).

Almost surely, 2^2638639049 is an apocalyptic number.

It is an amenable number.

2638639049 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638639049 is an equidigital number, since it uses as much as digits as its factorization.

2638639049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The square root of 2638639049 is about 51367.6848709381. The cubic root of 2638639049 is about 1381.8471115589.

The spelling of 2638639049 in words is "two billion, six hundred thirty-eight million, six hundred thirty-nine thousand, forty-nine".