749315909 has 6 divisors (see below), whose sum is σ = 752552370. Its totient is φ = 746083056.

The previous prime is 749315899. The next prime is 749315921. The reversal of 749315909 is 909513947.

749315909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 19775809 + 729540100 = 4447^2 + 27010^2 .

It is not a de Polignac number, because 749315909 - 2²⁴ = 732538693 is a prime.

It is a super-2 number, since 2×749315909² = 1122948662960992562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749315969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 448127 + ... + 449795.

It is an arithmetic number, because the mean of its divisors is an integer number (125425395).

Almost surely, 2^749315909 is an apocalyptic number.

It is an amenable number.

749315909 is a deficient number, since it is larger than the sum of its proper divisors (3236461).

749315909 is an frugal number, since it uses more digits than its factorization.

749315909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607 (or 1938 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 749315909 is about 27373.6352901839. The cubic root of 749315909 is about 908.2839733093.

The spelling of 749315909 in words is "seven hundred forty-nine million, three hundred fifteen thousand, nine hundred nine".