257306253 has 4 divisors (see below), whose sum is σ = 343075008. Its totient is φ = 171537500.

The previous prime is 257306243. The next prime is 257306263. The reversal of 257306253 is 352603752.

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 an interprime number because it is at equal distance from previous prime (257306243) and next prime (257306263).

It is a cyclic number.

It is not a de Polignac number, because 257306253 - 2¹⁷ = 257175181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257306233) 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, 42884373 + ... + 42884378.

It is an arithmetic number, because the mean of its divisors is an integer number (85768752).

Almost surely, 2^257306253 is an apocalyptic number.

It is an amenable number.

257306253 is a deficient number, since it is larger than the sum of its proper divisors (85768755).

257306253 is an equidigital number, since it uses as much as digits as its factorization.

257306253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85768754.

The product of its (nonzero) digits is 37800, while the sum is 33.

The square root of 257306253 is about 16040.7684666290. The cubic root of 257306253 is about 636.0385617021.

The spelling of 257306253 in words is "two hundred fifty-seven million, three hundred six thousand, two hundred fifty-three".