331340621 has 2 divisors, whose sum is σ = 331340622. Its totient is φ = 331340620.

The previous prime is 331340609. The next prime is 331340627. The reversal of 331340621 is 126043133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204890596 + 126450025 = 14314^2 + 11245^2 .

It is a cyclic number.

It is not a de Polignac number, because 331340621 - 2¹⁰ = 331339597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331340627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165670310 + 165670311.

It is an arithmetic number, because the mean of its divisors is an integer number (165670311).

Almost surely, 2^331340621 is an apocalyptic number.

It is an amenable number.

331340621 is a deficient number, since it is larger than the sum of its proper divisors (1).

331340621 is an equidigital number, since it uses as much as digits as its factorization.

331340621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 331340621 is about 18202.7641032894. The cubic root of 331340621 is about 691.9768423371.

Adding to 331340621 its reverse (126043133), we get a palindrome (457383754).

It can be divided in two parts, 3313 and 40621, that added together give a palindrome (43934).

The spelling of 331340621 in words is "three hundred thirty-one million, three hundred forty thousand, six hundred twenty-one".