257031149 has 2 divisors, whose sum is σ = 257031150. Its totient is φ = 257031148.

The previous prime is 257031139. The next prime is 257031157. The reversal of 257031149 is 941130752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214036900 + 42994249 = 14630^2 + 6557^2 .

It is a cyclic number.

It is not a de Polignac number, because 257031149 - 2⁴ = 257031133 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257031139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128515574 + 128515575.

It is an arithmetic number, because the mean of its divisors is an integer number (128515575).

Almost surely, 2^257031149 is an apocalyptic number.

It is an amenable number.

257031149 is a deficient number, since it is larger than the sum of its proper divisors (1).

257031149 is an equidigital number, since it uses as much as digits as its factorization.

257031149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 257031149 is about 16032.1910230636. The cubic root of 257031149 is about 635.8118031897.

The spelling of 257031149 in words is "two hundred fifty-seven million, thirty-one thousand, one hundred forty-nine".