331213 has 2 divisors, whose sum is σ = 331214. Its totient is φ = 331212.

The previous prime is 331207. The next prime is 331217. The reversal of 331213 is 312133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227529 + 103684 = 477^2 + 322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331193 and 331202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165606 + 165607.

It is an arithmetic number, because the mean of its divisors is an integer number (165607).

2³³¹²¹³ is an apocalyptic number.

It is an amenable number.

331213 is a deficient number, since it is larger than the sum of its proper divisors (1).

331213 is an equidigital number, since it uses as much as digits as its factorization.

331213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 13.

The square root of 331213 is about 575.5110772175. The cubic root of 331213 is about 69.1887989043.

Adding to 331213 its reverse (312133), we get a palindrome (643346).

It can be divided in two parts, 33121 and 3, that added together give a square (33124 = 182²).

The spelling of 331213 in words is "three hundred thirty-one thousand, two hundred thirteen".