313531 has 4 divisors (see below), whose sum is σ = 331992. Its totient is φ = 295072.

The previous prime is 313517. The next prime is 313543. The reversal of 313531 is 135313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135313 = 47 ⋅2879.

It is a cyclic number.

It is not a de Polignac number, because 313531 - 2¹³ = 305339 is a prime.

It is a super-2 number, since 2×313531² = 196603375922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313561) 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, 9205 + ... + 9238.

It is an arithmetic number, because the mean of its divisors is an integer number (82998).

2³¹³⁵³¹ is an apocalyptic number.

313531 is a deficient number, since it is larger than the sum of its proper divisors (18461).

313531 is a wasteful number, since it uses less digits than its factorization.

313531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18460.

The product of its digits is 135, while the sum is 16.

The square root of 313531 is about 559.9383894680. The cubic root of 313531 is about 67.9349868820.

Adding to 313531 its reverse (135313), we get a palindrome (448844).

The spelling of 313531 in words is "three hundred thirteen thousand, five hundred thirty-one".