331989601 has 2 divisors, whose sum is σ = 331989602. Its totient is φ = 331989600.

The previous prime is 331989599. The next prime is 331989629. The reversal of 331989601 is 106989133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 326344225 + 5645376 = 18065^2 + 2376^2 .

It is a cyclic number.

It is not a de Polignac number, because 331989601 - 2¹ = 331989599 is a prime.

It is a super-2 number, since 2×331989601² = 220434190344278402, which contains 22 as substring.

Together with 331989599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (331989001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165994800 + 165994801.

It is an arithmetic number, because the mean of its divisors is an integer number (165994801).

Almost surely, 2^331989601 is an apocalyptic number.

It is an amenable number.

331989601 is a deficient number, since it is larger than the sum of its proper divisors (1).

331989601 is an equidigital number, since it uses as much as digits as its factorization.

331989601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 331989601 is about 18220.5817964191. The cubic root of 331989601 is about 692.4283276316.

The spelling of 331989601 in words is "three hundred thirty-one million, nine hundred eighty-nine thousand, six hundred one".