331603 has 2 divisors, whose sum is σ = 331604. Its totient is φ = 331602.

The previous prime is 331589. The next prime is 331609. The reversal of 331603 is 306133.

It is a strong prime.

It is an emirp because it is prime and its reverse (306133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331603 is a prime.

331603 is a lucky number.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (331609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165801 + 165802.

It is an arithmetic number, because the mean of its divisors is an integer number (165802).

2³³¹⁶⁰³ is an apocalyptic number.

331603 is a deficient number, since it is larger than the sum of its proper divisors (1).

331603 is an equidigital number, since it uses as much as digits as its factorization.

331603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 331603 is about 575.8498068073. The cubic root of 331603 is about 69.2159446257.

Adding to 331603 its reverse (306133), we get a palindrome (637736).

The spelling of 331603 in words is "three hundred thirty-one thousand, six hundred three".