747985109 has 4 divisors (see below), whose sum is σ = 748775904. Its totient is φ = 747194316.

The previous prime is 747985097. The next prime is 747985123. The reversal of 747985109 is 901589747.

747985109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-747985109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747985309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393977 + ... + 395870.

It is an arithmetic number, because the mean of its divisors is an integer number (187193976).

Almost surely, 2^747985109 is an apocalyptic number.

It is an amenable number.

747985109 is a deficient number, since it is larger than the sum of its proper divisors (790795).

747985109 is an equidigital number, since it uses as much as digits as its factorization.

747985109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790794.

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 747985109 is about 27349.3164265581. The cubic root of 747985109 is about 907.7459445159.

The spelling of 747985109 in words is "seven hundred forty-seven million, nine hundred eighty-five thousand, one hundred nine".