313581 has 4 divisors (see below), whose sum is σ = 418112. Its totient is φ = 209052.

The previous prime is 313571. The next prime is 313583. The reversal of 313581 is 185313.

It is a happy number.

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 not a de Polignac number, because 313581 - 2⁵ = 313549 is a prime.

It is a super-2 number, since 2×313581² = 196666087122, which contains 22 as substring.

It is a D-number.

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 (313583) 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, 52261 + ... + 52266.

It is an arithmetic number, because the mean of its divisors is an integer number (104528).

2³¹³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

313581 is a deficient number, since it is larger than the sum of its proper divisors (104531).

313581 is a wasteful number, since it uses less digits than its factorization.

313581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104530.

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

The square root of 313581 is about 559.9830354573. The cubic root of 313581 is about 67.9385979750.

Adding to 313581 its reverse (185313), we get a palindrome (498894).

The spelling of 313581 in words is "three hundred thirteen thousand, five hundred eighty-one".