609531560991 has 24 divisors (see below), whose sum is σ = 918948466176. Its totient is φ = 388587695760.

The previous prime is 609531560977. The next prime is 609531561007. The reversal of 609531560991 is 199065135906.

It is a happy number.

It is not a de Polignac number, because 609531560991 - 2¹⁹ = 609531036703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609531560791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 442806 + ... + 1189596.

It is an arithmetic number, because the mean of its divisors is an integer number (38289519424).

Almost surely, 2^609531560991 is an apocalyptic number.

609531560991 is a deficient number, since it is larger than the sum of its proper divisors (309416905185).

609531560991 is a wasteful number, since it uses less digits than its factorization.

609531560991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750763 (or 750760 counting only the distinct ones).

The product of its (nonzero) digits is 1968300, while the sum is 54.

The spelling of 609531560991 in words is "six hundred nine billion, five hundred thirty-one million, five hundred sixty thousand, nine hundred ninety-one".