509581223697 has 24 divisors (see below), whose sum is σ = 840830562624. Its totient is φ = 268790094144.

The previous prime is 509581223651. The next prime is 509581223699. The reversal of 509581223697 is 796322185905.

It is a happy number.

It is not a de Polignac number, because 509581223697 - 2¹⁵ = 509581190929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (509581223699) 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 23 ways as a sum of consecutive naturals, for example, 71788678 + ... + 71795775.

It is an arithmetic number, because the mean of its divisors is an integer number (35034606776).

Almost surely, 2^509581223697 is an apocalyptic number.

It is an amenable number.

509581223697 is a deficient number, since it is larger than the sum of its proper divisors (331249338927).

509581223697 is a wasteful number, since it uses less digits than its factorization.

509581223697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143584489 (or 143584476 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 57.

The spelling of 509581223697 in words is "five hundred nine billion, five hundred eighty-one million, two hundred twenty-three thousand, six hundred ninety-seven".