313021 has 4 divisors (see below), whose sum is σ = 331452. Its totient is φ = 294592.

The previous prime is 313009. The next prime is 313031. The reversal of 313021 is 120313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120313 = 23 ⋅5231.

It can be written as a sum of positive squares in 2 ways, for example, as 164025 + 148996 = 405^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 313021 - 2⁵ = 312989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312989 and 313007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9190 + ... + 9223.

It is an arithmetic number, because the mean of its divisors is an integer number (82863).

2³¹³⁰²¹ is an apocalyptic number.

It is an amenable number.

313021 is a deficient number, since it is larger than the sum of its proper divisors (18431).

313021 is a wasteful number, since it uses less digits than its factorization.

313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18430.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 313021 is about 559.4827968758. The cubic root of 313021 is about 67.8981317850.

Adding to 313021 its reverse (120313), we get a palindrome (433334).

The spelling of 313021 in words is "three hundred thirteen thousand, twenty-one".