749744909 has 2 divisors, whose sum is σ = 749744910. Its totient is φ = 749744908.

The previous prime is 749744903. The next prime is 749744911. The reversal of 749744909 is 909447947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 553660900 + 196084009 = 23530^2 + 14003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-749744909 is a prime.

It is a Sophie Germain prime.

Together with 749744911, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (749744903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374872454 + 374872455.

It is an arithmetic number, because the mean of its divisors is an integer number (374872455).

Almost surely, 2^749744909 is an apocalyptic number.

It is an amenable number.

749744909 is a deficient number, since it is larger than the sum of its proper divisors (1).

749744909 is an equidigital number, since it uses as much as digits as its factorization.

749744909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 749744909 is about 27381.4701760150. The cubic root of 749744909 is about 908.4572778224.

The spelling of 749744909 in words is "seven hundred forty-nine million, seven hundred forty-four thousand, nine hundred nine".