626449909 has 4 divisors (see below), whose sum is σ = 648051660. Its totient is φ = 604848160.

The previous prime is 626449841. The next prime is 626449921. The reversal of 626449909 is 909944626.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 259918884 + 366531025 = 16122^2 + 19145^2 .

It is a cyclic number.

It is not a de Polignac number, because 626449909 - 2¹⁹ = 625925621 is a prime.

It is a super-2 number, since 2×626449909² = 784878976972216562, 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 (626449009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10800832 + ... + 10800889.

It is an arithmetic number, because the mean of its divisors is an integer number (162012915).

Almost surely, 2^626449909 is an apocalyptic number.

It is an amenable number.

626449909 is a deficient number, since it is larger than the sum of its proper divisors (21601751).

626449909 is a wasteful number, since it uses less digits than its factorization.

626449909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21601750.

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 626449909 is about 25028.9813815904. The cubic root of 626449909 is about 855.6486119436.

The spelling of 626449909 in words is "six hundred twenty-six million, four hundred forty-nine thousand, nine hundred nine".