257813849 has 4 divisors (see below), whose sum is σ = 258725136. Its totient is φ = 256902564.

The previous prime is 257813827. The next prime is 257813867. The reversal of 257813849 is 948318752.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257813849 - 2¹² = 257809753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257813819) 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 in 3 ways as a sum of consecutive naturals, for example, 455219 + ... + 455784.

It is an arithmetic number, because the mean of its divisors is an integer number (64681284).

Almost surely, 2^257813849 is an apocalyptic number.

It is an amenable number.

257813849 is a deficient number, since it is larger than the sum of its proper divisors (911287).

257813849 is an equidigital number, since it uses as much as digits as its factorization.

257813849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911286.

The product of its digits is 483840, while the sum is 47.

The square root of 257813849 is about 16056.5827310795. The cubic root of 257813849 is about 636.4565312866.

The spelling of 257813849 in words is "two hundred fifty-seven million, eight hundred thirteen thousand, eight hundred forty-nine".