316409 has 4 divisors (see below), whose sum is σ = 317604. Its totient is φ = 315216.

The previous prime is 316403. The next prime is 316423. The reversal of 316409 is 904613.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 183184 + 133225 = 428^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 316409 - 2⁸ = 316153 is a prime.

It is a super-2 number, since 2×316409² = 200229310562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316403) 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, 2 + ... + 795.

It is an arithmetic number, because the mean of its divisors is an integer number (79401).

2³¹⁶⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

316409 is a deficient number, since it is larger than the sum of its proper divisors (1195).

316409 is an equidigital number, since it uses as much as digits as its factorization.

316409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 316409 is about 562.5024444391. The cubic root of 316409 is about 68.1422196462.

The spelling of 316409 in words is "three hundred sixteen thousand, four hundred nine".