491831323 has 2 divisors, whose sum is σ = 491831324. Its totient is φ = 491831322.

The previous prime is 491831309. The next prime is 491831363. The reversal of 491831323 is 323138194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491831323 - 2²¹ = 489734171 is a prime.

It is not a weakly prime, because it can be changed into another prime (491831363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245915661 + 245915662.

It is an arithmetic number, because the mean of its divisors is an integer number (245915662).

Almost surely, 2^491831323 is an apocalyptic number.

491831323 is a deficient number, since it is larger than the sum of its proper divisors (1).

491831323 is an equidigital number, since it uses as much as digits as its factorization.

491831323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 491831323 is about 22177.2704136465. The cubic root of 491831323 is about 789.3544493968.

The spelling of 491831323 in words is "four hundred ninety-one million, eight hundred thirty-one thousand, three hundred twenty-three".