609123917 has 4 divisors (see below), whose sum is σ = 630128220. Its totient is φ = 588119616.

The previous prime is 609123913. The next prime is 609123941. The reversal of 609123917 is 719321906.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 719321906 = 2 ⋅359660953.

It can be written as a sum of positive squares in 2 ways, for example, as 457489321 + 151634596 = 21389^2 + 12314^2 .

It is a cyclic number.

It is not a de Polignac number, because 609123917 - 2² = 609123913 is a prime.

It is a super-2 number, since 2×609123917² = 742063892522845778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609123913) 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, 10502108 + ... + 10502165.

It is an arithmetic number, because the mean of its divisors is an integer number (157532055).

Almost surely, 2^609123917 is an apocalyptic number.

It is an amenable number.

609123917 is a deficient number, since it is larger than the sum of its proper divisors (21004303).

609123917 is a wasteful number, since it uses less digits than its factorization.

609123917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21004302.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 609123917 is about 24680.4359159234. The cubic root of 609123917 is about 847.6864036575.

The spelling of 609123917 in words is "six hundred nine million, one hundred twenty-three thousand, nine hundred seventeen".