2138028251 has 2 divisors, whose sum is σ = 2138028252. Its totient is φ = 2138028250.

The previous prime is 2138028203. The next prime is 2138028259. The reversal of 2138028251 is 1528208312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2138028251 - 2⁶ = 2138028187 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2138028259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069014125 + 1069014126.

It is an arithmetic number, because the mean of its divisors is an integer number (1069014126).

Almost surely, 2^2138028251 is an apocalyptic number.

2138028251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138028251 is an equidigital number, since it uses as much as digits as its factorization.

2138028251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 2138028251 is about 46238.8175778750. The cubic root of 2138028251 is about 1288.2628403043.

The spelling of 2138028251 in words is "two billion, one hundred thirty-eight million, twenty-eight thousand, two hundred fifty-one".