491641139 has 16 divisors (see below), whose sum is σ = 573215616. Its totient is φ = 416707200.

The previous prime is 491641099. The next prime is 491641177. The reversal of 491641139 is 931146194.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491641139 is a prime.

It is a super-2 number, since 2×491641139² = 483422019114434642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491641039) 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 15 ways as a sum of consecutive naturals, for example, 7724 + ... + 32294.

It is an arithmetic number, because the mean of its divisors is an integer number (35825976).

Almost surely, 2^491641139 is an apocalyptic number.

491641139 is a deficient number, since it is larger than the sum of its proper divisors (81574477).

491641139 is a wasteful number, since it uses less digits than its factorization.

491641139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24706.

The product of its digits is 23328, while the sum is 38.

The square root of 491641139 is about 22172.9821855338. The cubic root of 491641139 is about 789.2526923284.

The spelling of 491641139 in words is "four hundred ninety-one million, six hundred forty-one thousand, one hundred thirty-nine".