1306605749 has 2 divisors, whose sum is σ = 1306605750. Its totient is φ = 1306605748.

The previous prime is 1306605739. The next prime is 1306605803. The reversal of 1306605749 is 9475066031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279492900 + 27112849 = 35770^2 + 5207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1306605749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306605709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653302874 + 653302875.

It is an arithmetic number, because the mean of its divisors is an integer number (653302875).

Almost surely, 2^1306605749 is an apocalyptic number.

It is an amenable number.

1306605749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306605749 is an equidigital number, since it uses as much as digits as its factorization.

1306605749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 1306605749 is about 36147.0019365369. The cubic root of 1306605749 is about 1093.2383421731.

The spelling of 1306605749 in words is "one billion, three hundred six million, six hundred five thousand, seven hundred forty-nine".