747228809 has 2 divisors, whose sum is σ = 747228810. Its totient is φ = 747228808.

The previous prime is 747228799. The next prime is 747228851. The reversal of 747228809 is 908822747.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 703734784 + 43494025 = 26528^2 + 6595^2 .

It is a cyclic number.

It is not a de Polignac number, because 747228809 - 2⁴ = 747228793 is a prime.

It is not a weakly prime, because it can be changed into another prime (747228109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373614404 + 373614405.

It is an arithmetic number, because the mean of its divisors is an integer number (373614405).

Almost surely, 2^747228809 is an apocalyptic number.

It is an amenable number.

747228809 is a deficient number, since it is larger than the sum of its proper divisors (1).

747228809 is an equidigital number, since it uses as much as digits as its factorization.

747228809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 747228809 is about 27335.4862587077. The cubic root of 747228809 is about 907.4398957429.

The spelling of 747228809 in words is "seven hundred forty-seven million, two hundred twenty-eight thousand, eight hundred nine".