1331604749 has 2 divisors, whose sum is σ = 1331604750. Its totient is φ = 1331604748.

The previous prime is 1331604737. The next prime is 1331604761. The reversal of 1331604749 is 9474061331.

It is a balanced prime because it is at equal distance from previous prime (1331604737) and next prime (1331604761).

It can be written as a sum of positive squares in only one way, i.e., 680844649 + 650760100 = 26093^2 + 25510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331604749 - 2⁴ = 1331604733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331609749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665802374 + 665802375.

It is an arithmetic number, because the mean of its divisors is an integer number (665802375).

Almost surely, 2^1331604749 is an apocalyptic number.

It is an amenable number.

1331604749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331604749 is an equidigital number, since it uses as much as digits as its factorization.

1331604749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 1331604749 is about 36491.1598746875. The cubic root of 1331604749 is about 1100.1665722955.

The spelling of 1331604749 in words is "one billion, three hundred thirty-one million, six hundred four thousand, seven hundred forty-nine".