609776161 has 4 divisors (see below), whose sum is σ = 636288192. Its totient is φ = 583264132.

The previous prime is 609776143. The next prime is 609776173. The reversal of 609776161 is 161677906.

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 a cyclic number.

It is not a de Polignac number, because 609776161 - 2⁵ = 609776129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (609779161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13255981 + ... + 13256026.

It is an arithmetic number, because the mean of its divisors is an integer number (159072048).

Almost surely, 2^609776161 is an apocalyptic number.

It is an amenable number.

609776161 is a deficient number, since it is larger than the sum of its proper divisors (26512031).

609776161 is a wasteful number, since it uses less digits than its factorization.

609776161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26512030.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 609776161 is about 24693.6461665749. The cubic root of 609776161 is about 847.9888605284.

The spelling of 609776161 in words is "six hundred nine million, seven hundred seventy-six thousand, one hundred sixty-one".