257488853 has 2 divisors, whose sum is σ = 257488854. Its totient is φ = 257488852.

The previous prime is 257488849. The next prime is 257488867. The reversal of 257488853 is 358884752.

Added to its reverse (358884752) it gives a triangular number (616373605 = T₃₅₁₁₀).

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232318564 + 25170289 = 15242^2 + 5017^2 .

It is a cyclic number.

It is not a de Polignac number, because 257488853 - 2² = 257488849 is a prime.

It is a Sophie Germain 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 (257488823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128744426 + 128744427.

It is an arithmetic number, because the mean of its divisors is an integer number (128744427).

Almost surely, 2^257488853 is an apocalyptic number.

It is an amenable number.

257488853 is a deficient number, since it is larger than the sum of its proper divisors (1).

257488853 is an equidigital number, since it uses as much as digits as its factorization.

257488853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2150400, while the sum is 50.

The square root of 257488853 is about 16046.4592044476. The cubic root of 257488853 is about 636.1889832035.

Adding to 257488853 its reverse (358884752), we get a triangular number (616373605 = T₃₅₁₁₀).

The spelling of 257488853 in words is "two hundred fifty-seven million, four hundred eighty-eight thousand, eight hundred fifty-three".