491850187 has 4 divisors (see below), whose sum is σ = 491897536. Its totient is φ = 491802840.

The previous prime is 491850127. The next prime is 491850209. The reversal of 491850187 is 781058194.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491850187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491850127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588 + ... + 31369.

It is an arithmetic number, because the mean of its divisors is an integer number (122974384).

Almost surely, 2^491850187 is an apocalyptic number.

491850187 is a deficient number, since it is larger than the sum of its proper divisors (47349).

491850187 is a wasteful number, since it uses less digits than its factorization.

491850187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47348.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 491850187 is about 22177.6957098793. The cubic root of 491850187 is about 789.3645410626.

The spelling of 491850187 in words is "four hundred ninety-one million, eight hundred fifty thousand, one hundred eighty-seven".