2638189049 has 2 divisors, whose sum is σ = 2638189050. Its totient is φ = 2638189048.

The previous prime is 2638189027. The next prime is 2638189091. The reversal of 2638189049 is 9409818362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1647954025 + 990235024 = 40595^2 + 31468^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638189049 - 2¹² = 2638184953 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 = 2638188988 and 2638189006.

It is not a weakly prime, because it can be changed into another prime (2638189949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319094524 + 1319094525.

It is an arithmetic number, because the mean of its divisors is an integer number (1319094525).

Almost surely, 2^2638189049 is an apocalyptic number.

It is an amenable number.

2638189049 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638189049 is an equidigital number, since it uses as much as digits as its factorization.

2638189049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 2638189049 is about 51363.3044984452. The cubic root of 2638189049 is about 1381.7685525567.

The spelling of 2638189049 in words is "two billion, six hundred thirty-eight million, one hundred eighty-nine thousand, forty-nine".