257454139 has 2 divisors, whose sum is σ = 257454140. Its totient is φ = 257454138.

The previous prime is 257454121. The next prime is 257454187. The reversal of 257454139 is 931454752.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257454139 - 2⁵ = 257454107 is a prime.

It is not a weakly prime, because it can be changed into another prime (257454739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128727069 + 128727070.

It is an arithmetic number, because the mean of its divisors is an integer number (128727070).

Almost surely, 2^257454139 is an apocalyptic number.

257454139 is a deficient number, since it is larger than the sum of its proper divisors (1).

257454139 is an equidigital number, since it uses as much as digits as its factorization.

257454139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 40.

The square root of 257454139 is about 16045.3774963383. The cubic root of 257454139 is about 636.1603921187.

The spelling of 257454139 in words is "two hundred fifty-seven million, four hundred fifty-four thousand, one hundred thirty-nine".