612385609 has 4 divisors (see below), whose sum is σ = 668057040. Its totient is φ = 556714180.

The previous prime is 612385597. The next prime is 612385673. The reversal of 612385609 is 906583216.

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 not a de Polignac number, because 612385609 - 2¹⁹ = 611861321 is a prime.

It is a super-2 number, since 2×612385609² = 750032268220601762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612385699) 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, 27835699 + ... + 27835720.

It is an arithmetic number, because the mean of its divisors is an integer number (167014260).

Almost surely, 2^612385609 is an apocalyptic number.

It is an amenable number.

612385609 is a deficient number, since it is larger than the sum of its proper divisors (55671431).

612385609 is a wasteful number, since it uses less digits than its factorization.

612385609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55671430.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 612385609 is about 24746.4261864213. The cubic root of 612385609 is about 849.1967539781.

The spelling of 612385609 in words is "six hundred twelve million, three hundred eighty-five thousand, six hundred nine".