331489421 has 2 divisors, whose sum is σ = 331489422. Its totient is φ = 331489420.

The previous prime is 331489399. The next prime is 331489439. The reversal of 331489421 is 124984133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253255396 + 78234025 = 15914^2 + 8845^2 .

It is a cyclic number.

It is not a de Polignac number, because 331489421 - 2⁶ = 331489357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331489441) 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, 165744710 + 165744711.

It is an arithmetic number, because the mean of its divisors is an integer number (165744711).

Almost surely, 2^331489421 is an apocalyptic number.

It is an amenable number.

331489421 is a deficient number, since it is larger than the sum of its proper divisors (1).

331489421 is an equidigital number, since it uses as much as digits as its factorization.

331489421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 331489421 is about 18206.8509358428. The cubic root of 331489421 is about 692.0804122366.

The spelling of 331489421 in words is "three hundred thirty-one million, four hundred eighty-nine thousand, four hundred twenty-one".