331494689 has 2 divisors, whose sum is σ = 331494690. Its totient is φ = 331494688.

The previous prime is 331494661. The next prime is 331494703. The reversal of 331494689 is 986494133.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255456289 + 76038400 = 15983^2 + 8720^2 .

It is an emirp because it is prime and its reverse (986494133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331494689 is a prime.

It is not a weakly prime, because it can be changed into another prime (331494089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165747344 + 165747345.

It is an arithmetic number, because the mean of its divisors is an integer number (165747345).

Almost surely, 2^331494689 is an apocalyptic number.

It is an amenable number.

331494689 is a deficient number, since it is larger than the sum of its proper divisors (1).

331494689 is an equidigital number, since it uses as much as digits as its factorization.

331494689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 47.

The square root of 331494689 is about 18206.9956060850. The cubic root of 331494689 is about 692.0840783770.

The spelling of 331494689 in words is "three hundred thirty-one million, four hundred ninety-four thousand, six hundred eighty-nine".