491115071 has 2 divisors, whose sum is σ = 491115072. Its totient is φ = 491115070.

The previous prime is 491115049. The next prime is 491115073. The reversal of 491115071 is 170511194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491115071 - 2¹⁰ = 491114047 is a prime.

It is a Sophie Germain prime.

Together with 491115073, 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 (491115073) 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, 245557535 + 245557536.

It is an arithmetic number, because the mean of its divisors is an integer number (245557536).

Almost surely, 2^491115071 is an apocalyptic number.

491115071 is a deficient number, since it is larger than the sum of its proper divisors (1).

491115071 is an equidigital number, since it uses as much as digits as its factorization.

491115071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 29.

The square root of 491115071 is about 22161.1161948129. The cubic root of 491115071 is about 788.9710853241.

The spelling of 491115071 in words is "four hundred ninety-one million, one hundred fifteen thousand, seventy-one".