257442049 has 4 divisors (see below), whose sum is σ = 257785600. Its totient is φ = 257098500.

The previous prime is 257442007. The next prime is 257442071. The reversal of 257442049 is 940244752.

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 257442049 - 2¹⁵ = 257409281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257441999 and 257442017.

It is not an unprimeable number, because it can be changed into a prime (257442089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170649 + ... + 172150.

It is an arithmetic number, because the mean of its divisors is an integer number (64446400).

Almost surely, 2^257442049 is an apocalyptic number.

It is an amenable number.

257442049 is a deficient number, since it is larger than the sum of its proper divisors (343551).

257442049 is an equidigital number, since it uses as much as digits as its factorization.

257442049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343550.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 257442049 is about 16045.0007478965. Note that the first 3 decimals coincide. The cubic root of 257442049 is about 636.1504339704.

The spelling of 257442049 in words is "two hundred fifty-seven million, four hundred forty-two thousand, forty-nine".