2638506121 has 2 divisors, whose sum is σ = 2638506122. Its totient is φ = 2638506120.

The previous prime is 2638506107. The next prime is 2638506127. The reversal of 2638506121 is 1216058362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2165878521 + 472627600 = 46539^2 + 21740^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638506121 - 2⁹ = 2638505609 is a prime.

It is not a weakly prime, because it can be changed into another prime (2638506127) 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 as a sum of consecutive naturals, namely, 1319253060 + 1319253061.

It is an arithmetic number, because the mean of its divisors is an integer number (1319253061).

Almost surely, 2^2638506121 is an apocalyptic number.

It is an amenable number.

2638506121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638506121 is an equidigital number, since it uses as much as digits as its factorization.

2638506121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2638506121 is about 51366.3909672463. The cubic root of 2638506121 is about 1381.8239065084.

The spelling of 2638506121 in words is "two billion, six hundred thirty-eight million, five hundred six thousand, one hundred twenty-one".