509636919191 has 16 divisors (see below), whose sum is σ = 520640395200. Its totient is φ = 498754080000.

The previous prime is 509636919109. The next prime is 509636919199. The reversal of 509636919191 is 191919636905.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509636919191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 509636919191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509636919199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33260630 + ... + 33275948.

It is an arithmetic number, because the mean of its divisors is an integer number (32540024700).

Almost surely, 2^509636919191 is an apocalyptic number.

509636919191 is a deficient number, since it is larger than the sum of its proper divisors (11003476009).

509636919191 is a wasteful number, since it uses less digits than its factorization.

509636919191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19210.

The product of its (nonzero) digits is 3542940, while the sum is 59.

The spelling of 509636919191 in words is "five hundred nine billion, six hundred thirty-six million, nine hundred nineteen thousand, one hundred ninety-one".