257800139 has 2 divisors, whose sum is σ = 257800140. Its totient is φ = 257800138.

The previous prime is 257800133. The next prime is 257800181. The reversal of 257800139 is 931008752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257800139 - 2¹² = 257796043 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 257800099 and 257800108.

It is not a weakly prime, because it can be changed into another prime (257800133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128900069 + 128900070.

It is an arithmetic number, because the mean of its divisors is an integer number (128900070).

Almost surely, 2^257800139 is an apocalyptic number.

257800139 is a deficient number, since it is larger than the sum of its proper divisors (1).

257800139 is an equidigital number, since it uses as much as digits as its factorization.

257800139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 257800139 is about 16056.1557976995. The cubic root of 257800139 is about 636.4452492786.

The spelling of 257800139 in words is "two hundred fifty-seven million, eight hundred thousand, one hundred thirty-nine".