257631213 has 8 divisors (see below), whose sum is σ = 392580928. Its totient is φ = 147217824.

The previous prime is 257631193. The next prime is 257631307. The reversal of 257631213 is 312136752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257631213 - 2⁹ = 257630701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257631113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6134056 + ... + 6134097.

It is an arithmetic number, because the mean of its divisors is an integer number (49072616).

Almost surely, 2^257631213 is an apocalyptic number.

It is an amenable number.

257631213 is a deficient number, since it is larger than the sum of its proper divisors (134949715).

257631213 is a wasteful number, since it uses less digits than its factorization.

257631213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12268163.

The product of its digits is 7560, while the sum is 30.

The square root of 257631213 is about 16050.8944610573. The cubic root of 257631213 is about 636.3062066312.

Adding to 257631213 its reverse (312136752), we get a palindrome (569767965).

The spelling of 257631213 in words is "two hundred fifty-seven million, six hundred thirty-one thousand, two hundred thirteen".