317421257 has 4 divisors (see below), whose sum is σ = 318504900. Its totient is φ = 316337616.

The previous prime is 317421233. The next prime is 317421281. The reversal of 317421257 is 752124713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752124713 = 1459 ⋅515507.

It is an interprime number because it is at equal distance from previous prime (317421233) and next prime (317421281).

It can be written as a sum of positive squares in 2 ways, for example, as 256128016 + 61293241 = 16004^2 + 7829^2 .

It is a cyclic number.

It is not a de Polignac number, because 317421257 - 2¹² = 317417161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (317421287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541382 + ... + 541967.

It is an arithmetic number, because the mean of its divisors is an integer number (79626225).

Almost surely, 2^317421257 is an apocalyptic number.

It is an amenable number.

317421257 is a deficient number, since it is larger than the sum of its proper divisors (1083643).

317421257 is a wasteful number, since it uses less digits than its factorization.

317421257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083642.

The product of its digits is 11760, while the sum is 32.

The square root of 317421257 is about 17816.3199623267. The cubic root of 317421257 is about 682.1480924980.

The spelling of 317421257 in words is "three hundred seventeen million, four hundred twenty-one thousand, two hundred fifty-seven".