257855953 has 2 divisors, whose sum is σ = 257855954. Its totient is φ = 257855952.

The previous prime is 257855947. The next prime is 257855957. The reversal of 257855953 is 359558752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130233744 + 127622209 = 11412^2 + 11297^2 .

It is a cyclic number.

It is not a de Polignac number, because 257855953 - 2¹³ = 257847761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257855897 and 257855906.

It is not a weakly prime, because it can be changed into another prime (257855957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128927976 + 128927977.

It is an arithmetic number, because the mean of its divisors is an integer number (128927977).

Almost surely, 2^257855953 is an apocalyptic number.

It is an amenable number.

257855953 is a deficient number, since it is larger than the sum of its proper divisors (1).

257855953 is an equidigital number, since it uses as much as digits as its factorization.

257855953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890000, while the sum is 49.

The square root of 257855953 is about 16057.8937909055. The cubic root of 257855953 is about 636.4911763186.

The spelling of 257855953 in words is "two hundred fifty-seven million, eight hundred fifty-five thousand, nine hundred fifty-three".