331426621 has 2 divisors, whose sum is σ = 331426622. Its totient is φ = 331426620.

The previous prime is 331426609. The next prime is 331426691. The reversal of 331426621 is 126624133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187306596 + 144120025 = 13686^2 + 12005^2 .

It is a cyclic number.

It is not a de Polignac number, because 331426621 - 2¹¹ = 331424573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 331426621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331426691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165713310 + 165713311.

It is an arithmetic number, because the mean of its divisors is an integer number (165713311).

Almost surely, 2^331426621 is an apocalyptic number.

It is an amenable number.

331426621 is a deficient number, since it is larger than the sum of its proper divisors (1).

331426621 is an equidigital number, since it uses as much as digits as its factorization.

331426621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 331426621 is about 18205.1262286203. The cubic root of 331426621 is about 692.0367050652.

The spelling of 331426621 in words is "three hundred thirty-one million, four hundred twenty-six thousand, six hundred twenty-one".