491384123 has 2 divisors, whose sum is σ = 491384124. Its totient is φ = 491384122.

The previous prime is 491384083. The next prime is 491384129. The reversal of 491384123 is 321483194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491384123 - 2²² = 487189819 is a prime.

It is not a weakly prime, because it can be changed into another prime (491384129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245692061 + 245692062.

It is an arithmetic number, because the mean of its divisors is an integer number (245692062).

Almost surely, 2^491384123 is an apocalyptic number.

491384123 is a deficient number, since it is larger than the sum of its proper divisors (1).

491384123 is an equidigital number, since it uses as much as digits as its factorization.

491384123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 491384123 is about 22167.1857257524. The cubic root of 491384123 is about 789.1151354043.

The spelling of 491384123 in words is "four hundred ninety-one million, three hundred eighty-four thousand, one hundred twenty-three".