621000609 has 4 divisors (see below), whose sum is σ = 828000816. Its totient is φ = 414000404.

The previous prime is 621000559. The next prime is 621000623. The reversal of 621000609 is 906000126.

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 not a de Polignac number, because 621000609 - 2⁸ = 621000353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621000209) 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, 103500099 + ... + 103500104.

It is an arithmetic number, because the mean of its divisors is an integer number (207000204).

Almost surely, 2^621000609 is an apocalyptic number.

It is an amenable number.

621000609 is a deficient number, since it is larger than the sum of its proper divisors (207000207).

621000609 is a wasteful number, since it uses less digits than its factorization.

621000609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207000206.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 621000609 is about 24919.8838079153. The cubic root of 621000609 is about 853.1603728467.

The spelling of 621000609 in words is "six hundred twenty-one million, six hundred nine", and thus it is an aban number.