331449491 has 2 divisors, whose sum is σ = 331449492. Its totient is φ = 331449490.

The previous prime is 331449479. The next prime is 331449529. The reversal of 331449491 is 194944133.

It is a happy number.

It is an a-pointer prime, because the next prime (331449529) can be obtained adding 331449491 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331449491 is a prime.

It is a super-3 number, since 3×331449491³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331449401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165724745 + 165724746.

It is an arithmetic number, because the mean of its divisors is an integer number (165724746).

Almost surely, 2^331449491 is an apocalyptic number.

331449491 is a deficient number, since it is larger than the sum of its proper divisors (1).

331449491 is an equidigital number, since it uses as much as digits as its factorization.

331449491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 331449491 is about 18205.7543375714. The cubic root of 331449491 is about 692.0526226313.

The spelling of 331449491 in words is "three hundred thirty-one million, four hundred forty-nine thousand, four hundred ninety-one".