491541191 has 4 divisors (see below), whose sum is σ = 517411800. Its totient is φ = 465670584.

The previous prime is 491541187. The next prime is 491541203. The reversal of 491541191 is 191145194.

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

It is a cyclic number.

It is not a de Polignac number, because 491541191 - 2² = 491541187 is a prime.

It is a super-2 number, since 2×491541191² = 483225484899396962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491541101) 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, 12935276 + ... + 12935313.

It is an arithmetic number, because the mean of its divisors is an integer number (129352950).

Almost surely, 2^491541191 is an apocalyptic number.

491541191 is a deficient number, since it is larger than the sum of its proper divisors (25870609).

491541191 is a wasteful number, since it uses less digits than its factorization.

491541191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25870608.

The product of its digits is 6480, while the sum is 35.

The square root of 491541191 is about 22170.7282469476. The cubic root of 491541191 is about 789.1992050941.

The spelling of 491541191 in words is "four hundred ninety-one million, five hundred forty-one thousand, one hundred ninety-one".