331613 has 2 divisors, whose sum is σ = 331614. Its totient is φ = 331612.

The previous prime is 331609. The next prime is 331651. The reversal of 331613 is 316133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284089 + 47524 = 533^2 + 218^2 .

It is an emirp because it is prime and its reverse (316133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331613 - 2² = 331609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331591 and 331600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331603) 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 as a sum of consecutive naturals, namely, 165806 + 165807.

It is an arithmetic number, because the mean of its divisors is an integer number (165807).

2³³¹⁶¹³ is an apocalyptic number.

It is an amenable number.

331613 is a deficient number, since it is larger than the sum of its proper divisors (1).

331613 is an equidigital number, since it uses as much as digits as its factorization.

331613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 17.

The square root of 331613 is about 575.8584895615. The cubic root of 331613 is about 69.2166403899.

Adding to 331613 its reverse (316133), we get a palindrome (647746).

The spelling of 331613 in words is "three hundred thirty-one thousand, six hundred thirteen".