2138251 has 2 divisors, whose sum is σ = 2138252. Its totient is φ = 2138250.

The previous prime is 2138249. The next prime is 2138263. The reversal of 2138251 is 1528312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2138251 - 2¹ = 2138249 is a prime.

Together with 2138249, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2138221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069125 + 1069126.

It is an arithmetic number, because the mean of its divisors is an integer number (1069126).

2^2138251 is an apocalyptic number.

2138251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138251 is an equidigital number, since it uses as much as digits as its factorization.

2138251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 22.

The square root of 2138251 is about 1462.2759657465. The cubic root of 2138251 is about 128.8307577676.

It can be divided in two parts, 213 and 8251, that added together give a square (8464 = 92²).

The spelling of 2138251 in words is "two million, one hundred thirty-eight thousand, two hundred fifty-one".