257197 has 4 divisors (see below), whose sum is σ = 258336. Its totient is φ = 256060.

The previous prime is 257189. The next prime is 257219. The reversal of 257197 is 791752.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 257197 - 2³ = 257189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257107) 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, 103 + ... + 724.

It is an arithmetic number, because the mean of its divisors is an integer number (64584).

2²⁵⁷¹⁹⁷ is an apocalyptic number.

It is an amenable number.

257197 is a deficient number, since it is larger than the sum of its proper divisors (1139).

257197 is an equidigital number, since it uses as much as digits as its factorization.

257197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138.

The product of its digits is 4410, while the sum is 31.

The square root of 257197 is about 507.1459356043. The cubic root of 257197 is about 63.5948527670.

It can be divided in two parts, 257 and 197, that added together give a palindrome (454).

The spelling of 257197 in words is "two hundred fifty-seven thousand, one hundred ninety-seven".