257540253 has 4 divisors (see below), whose sum is σ = 343387008. Its totient is φ = 171693500.

The previous prime is 257540249. The next prime is 257540263. The reversal of 257540253 is 352045752.

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 257540253 - 2² = 257540249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257540263) 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, 42923373 + ... + 42923378.

It is an arithmetic number, because the mean of its divisors is an integer number (85846752).

Almost surely, 2^257540253 is an apocalyptic number.

It is an amenable number.

257540253 is a deficient number, since it is larger than the sum of its proper divisors (85846755).

257540253 is an equidigital number, since it uses as much as digits as its factorization.

257540253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85846754.

The product of its (nonzero) digits is 42000, while the sum is 33.

The square root of 257540253 is about 16048.0607239629. The cubic root of 257540253 is about 636.2313124639.

The spelling of 257540253 in words is "two hundred fifty-seven million, five hundred forty thousand, two hundred fifty-three".