491354187 has 16 divisors (see below), whose sum is σ = 663756288. Its totient is φ = 323282880.

The previous prime is 491354131. The next prime is 491354203. The reversal of 491354187 is 781453194.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-491354187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491354287) 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, 93543 + ... + 98655.

It is an arithmetic number, because the mean of its divisors is an integer number (41484768).

Almost surely, 2^491354187 is an apocalyptic number.

491354187 is a deficient number, since it is larger than the sum of its proper divisors (172402101).

491354187 is a wasteful number, since it uses less digits than its factorization.

491354187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530.

The product of its digits is 120960, while the sum is 42.

The square root of 491354187 is about 22166.5104831590. The cubic root of 491354187 is about 789.0991103102.

The spelling of 491354187 in words is "four hundred ninety-one million, three hundred fifty-four thousand, one hundred eighty-seven".