609509961 has 16 divisors (see below), whose sum is σ = 904262400. Its totient is φ = 405761904.

The previous prime is 609509951. The next prime is 609509963. The reversal of 609509961 is 169905906.

It is not a de Polignac number, because 609509961 - 2⁶ = 609509897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (609509963) 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 15 ways as a sum of consecutive naturals, for example, 3715 + ... + 35111.

It is an arithmetic number, because the mean of its divisors is an integer number (56516400).

Almost surely, 2^609509961 is an apocalyptic number.

It is an amenable number.

609509961 is a deficient number, since it is larger than the sum of its proper divisors (294752439).

609509961 is a wasteful number, since it uses less digits than its factorization.

609509961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32125 (or 32119 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 609509961 is about 24688.2555276796. The cubic root of 609509961 is about 847.8654450275.

The spelling of 609509961 in words is "six hundred nine million, five hundred nine thousand, nine hundred sixty-one".