331427749 has 2 divisors, whose sum is σ = 331427750. Its totient is φ = 331427748.

The previous prime is 331427741. The next prime is 331427771. The reversal of 331427749 is 947724133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275327649 + 56100100 = 16593^2 + 7490^2 .

It is an emirp because it is prime and its reverse (947724133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331427749 - 2³ = 331427741 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331427741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165713874 + 165713875.

It is an arithmetic number, because the mean of its divisors is an integer number (165713875).

Almost surely, 2^331427749 is an apocalyptic number.

It is an amenable number.

331427749 is a deficient number, since it is larger than the sum of its proper divisors (1).

331427749 is an equidigital number, since it uses as much as digits as its factorization.

331427749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 40.

The square root of 331427749 is about 18205.1572088790. The cubic root of 331427749 is about 692.0374901726.

The spelling of 331427749 in words is "three hundred thirty-one million, four hundred twenty-seven thousand, seven hundred forty-nine".