491831361 has 24 divisors (see below), whose sum is σ = 827236800. Its totient is φ = 275741856.

The previous prime is 491831323. The next prime is 491831363. The reversal of 491831361 is 163138194.

It is not a de Polignac number, because 491831361 - 2⁶ = 491831297 is a prime.

It is a super-2 number, since 2×491831361² = 483796175326224642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491831363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70311 + ... + 76988.

It is an arithmetic number, because the mean of its divisors is an integer number (34468200).

Almost surely, 2^491831361 is an apocalyptic number.

It is an amenable number.

491831361 is a deficient number, since it is larger than the sum of its proper divisors (335405439).

491831361 is a wasteful number, since it uses less digits than its factorization.

491831361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147365 (or 147362 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 491831361 is about 22177.2712703795. The cubic root of 491831361 is about 789.3544697259.

The spelling of 491831361 in words is "four hundred ninety-one million, eight hundred thirty-one thousand, three hundred sixty-one".