315381 has 16 divisors (see below), whose sum is σ = 483840. Its totient is φ = 180720.

The previous prime is 315377. The next prime is 315389. The reversal of 315381 is 183513.

It is a happy number.

It is not a de Polignac number, because 315381 - 2² = 315377 is a prime.

It is a super-2 number, since 2×315381² = 198930350322, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 315381.

It is not an unprimeable number, because it can be changed into a prime (315389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376 + ... + 878.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2³¹⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

315381 is a deficient number, since it is larger than the sum of its proper divisors (168459).

315381 is a wasteful number, since it uses less digits than its factorization.

315381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536.

The product of its digits is 360, while the sum is 21.

The square root of 315381 is about 561.5879272207. The cubic root of 315381 is about 68.0683424783.

Adding to 315381 its reverse (183513), we get a palindrome (498894).

It can be divided in two parts, 315 and 381, that added together give a palindrome (696).

The spelling of 315381 in words is "three hundred fifteen thousand, three hundred eighty-one".