508221261187 has 4 divisors (see below), whose sum is σ = 508402577320. Its totient is φ = 508039945056.

The previous prime is 508221261143. The next prime is 508221261199. The reversal of 508221261187 is 781162122805.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-508221261187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (508221261137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90653862 + ... + 90659467.

It is an arithmetic number, because the mean of its divisors is an integer number (127100644330).

Almost surely, 2^508221261187 is an apocalyptic number.

508221261187 is a deficient number, since it is larger than the sum of its proper divisors (181316133).

508221261187 is a wasteful number, since it uses less digits than its factorization.

508221261187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181316132.

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 508221261187 in words is "five hundred eight billion, two hundred twenty-one million, two hundred sixty-one thousand, one hundred eighty-seven".