609999623 has 4 divisors (see below), whose sum is σ = 610064448. Its totient is φ = 609934800.

The previous prime is 609999589. The next prime is 609999653. The reversal of 609999623 is 326999906.

It is a happy 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 is a cyclic number.

It is not a de Polignac number, because 609999623 - 2¹² = 609995527 is a prime.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 609 and 999623 contains 609999623 itself.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609999653) 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, 15278 + ... + 38123.

It is an arithmetic number, because the mean of its divisors is an integer number (152516112).

Almost surely, 2^609999623 is an apocalyptic number.

609999623 is a deficient number, since it is larger than the sum of its proper divisors (64825).

609999623 is a wasteful number, since it uses less digits than its factorization.

609999623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64824.

The product of its (nonzero) digits is 1417176, while the sum is 53.

The square root of 609999623 is about 24698.1704383138. The cubic root of 609999623 is about 848.0924341324.

The spelling of 609999623 in words is "six hundred nine million, nine hundred ninety-nine thousand, six hundred twenty-three".