501625609 has 3 divisors (see below), whose sum is σ = 501648007. Its totient is φ = 501603212.

The previous prime is 501625603. The next prime is 501625633. The reversal of 501625609 is 906526105.

It is a happy number.

The square root of 501625609 is 22397.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 484220025 + 17405584 = 22005^2 + 4172^2 .

It is not a de Polignac number, because 501625609 - 2⁵ = 501625577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501625603) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11199 + ... + 33595.

Almost surely, 2^501625609 is an apocalyptic number.

501625609 is the 22397-th square number.

501625609 is the 11199-th centered octagonal number.

It is an amenable number.

501625609 is a deficient number, since it is larger than the sum of its proper divisors (22398).

501625609 is an frugal number, since it uses more digits than its factorization.

501625609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44794 (or 22397 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The cubic root of 501625609 is about 794.5597599490.

It can be divided in two parts, 5016 and 25609, that added together give a square (30625 = 175²).

The spelling of 501625609 in words is "five hundred one million, six hundred twenty-five thousand, six hundred nine".