1923085609 has 3 divisors (see below), whose sum is σ = 1923129463. Its totient is φ = 1923041756.

The previous prime is 1923085597. The next prime is 1923085631. The reversal of 1923085609 is 9065803291.

It is a happy number.

The square root of 1923085609 is 43853.

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., 256160025 + 1666925584 = 16005^2 + 40828^2 .

It is not a de Polignac number, because 1923085609 - 2¹⁵ = 1923052841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1923085669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 21927 + ... + 65779.

Almost surely, 2^1923085609 is an apocalyptic number.

1923085609 is the 43853-rd square number.

1923085609 is the 21927-th centered octagonal number.

It is an amenable number.

1923085609 is a deficient number, since it is larger than the sum of its proper divisors (43854).

1923085609 is an frugal number, since it uses more digits than its factorization.

1923085609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87706 (or 43853 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The cubic root of 1923085609 is about 1243.5584588448.

The spelling of 1923085609 in words is "one billion, nine hundred twenty-three million, eighty-five thousand, six hundred nine".