257990503 has 4 divisors (see below), whose sum is σ = 258196680. Its totient is φ = 257784328.

The previous prime is 257990501. The next prime is 257990507. The reversal of 257990503 is 305099752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257990503 - 2¹ = 257990501 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257990501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101200 + ... + 103717.

It is an arithmetic number, because the mean of its divisors is an integer number (64549170).

Almost surely, 2^257990503 is an apocalyptic number.

257990503 is a deficient number, since it is larger than the sum of its proper divisors (206177).

257990503 is a wasteful number, since it uses less digits than its factorization.

257990503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206176.

The product of its (nonzero) digits is 85050, while the sum is 40.

The square root of 257990503 is about 16062.0827727913. The cubic root of 257990503 is about 636.6018647287.

The spelling of 257990503 in words is "two hundred fifty-seven million, nine hundred ninety thousand, five hundred three".