491280239 has 2 divisors, whose sum is σ = 491280240. Its totient is φ = 491280238.

The previous prime is 491280227. The next prime is 491280241. The reversal of 491280239 is 932082194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491280239 - 2¹² = 491276143 is a prime.

Together with 491280241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491280259) 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 as a sum of consecutive naturals, namely, 245640119 + 245640120.

It is an arithmetic number, because the mean of its divisors is an integer number (245640120).

Almost surely, 2^491280239 is an apocalyptic number.

491280239 is a deficient number, since it is larger than the sum of its proper divisors (1).

491280239 is an equidigital number, since it uses as much as digits as its factorization.

491280239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 491280239 is about 22164.8424086435. The cubic root of 491280239 is about 789.0595222832.

The spelling of 491280239 in words is "four hundred ninety-one million, two hundred eighty thousand, two hundred thirty-nine".