257732213 has 4 divisors (see below), whose sum is σ = 258017280. Its totient is φ = 257447148.

The previous prime is 257732197. The next prime is 257732219. The reversal of 257732213 is 312237752.

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 257732213 - 2⁴ = 257732197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257732213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257732219) 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, 141173 + ... + 142986.

It is an arithmetic number, because the mean of its divisors is an integer number (64504320).

Almost surely, 2^257732213 is an apocalyptic number.

It is an amenable number.

257732213 is a deficient number, since it is larger than the sum of its proper divisors (285067).

257732213 is an equidigital number, since it uses as much as digits as its factorization.

257732213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285066.

The product of its digits is 17640, while the sum is 32.

The square root of 257732213 is about 16054.0403948663. The cubic root of 257732213 is about 636.3893468295.

Adding to 257732213 its reverse (312237752), we get a palindrome (569969965).

The spelling of 257732213 in words is "two hundred fifty-seven million, seven hundred thirty-two thousand, two hundred thirteen".