609139819 has 4 divisors (see below), whose sum is σ = 609224400. Its totient is φ = 609055240.

The previous prime is 609139799. The next prime is 609139877. The reversal of 609139819 is 918931906.

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

It is a cyclic number.

It is not a de Polignac number, because 609139819 - 2¹⁷ = 609008747 is a prime.

It is a super-5 number, since 5×609139819⁵ (a number of 45 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609139319) 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, 30367 + ... + 46264.

It is an arithmetic number, because the mean of its divisors is an integer number (152306100).

Almost surely, 2^609139819 is an apocalyptic number.

609139819 is a deficient number, since it is larger than the sum of its proper divisors (84581).

609139819 is an equidigital number, since it uses as much as digits as its factorization.

609139819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84580.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 609139819 is about 24680.7580718259. The cubic root of 609139819 is about 847.6937802582.

The spelling of 609139819 in words is "six hundred nine million, one hundred thirty-nine thousand, eight hundred nineteen".