251275139 has 2 divisors, whose sum is σ = 251275140. Its totient is φ = 251275138.

The previous prime is 251275127. The next prime is 251275151. The reversal of 251275139 is 931572152.

It is a balanced prime because it is at equal distance from previous prime (251275127) and next prime (251275151).

It is a cyclic number.

It is not a de Polignac number, because 251275139 - 2⁸ = 251274883 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 251275099 and 251275108.

It is not a weakly prime, because it can be changed into another prime (251275039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125637569 + 125637570.

It is an arithmetic number, because the mean of its divisors is an integer number (125637570).

Almost surely, 2^251275139 is an apocalyptic number.

251275139 is a deficient number, since it is larger than the sum of its proper divisors (1).

251275139 is an equidigital number, since it uses as much as digits as its factorization.

251275139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 35.

The square root of 251275139 is about 15851.6604493031. The cubic root of 251275139 is about 631.0297587522.

The spelling of 251275139 in words is "two hundred fifty-one million, two hundred seventy-five thousand, one hundred thirty-nine".