491415919 has 2 divisors, whose sum is σ = 491415920. Its totient is φ = 491415918.

The previous prime is 491415893. The next prime is 491415971. The reversal of 491415919 is 919514194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491415919 - 2⁵ = 491415887 is a prime.

It is a super-2 number, since 2×491415919² = 482979210893229122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491415979) 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, 245707959 + 245707960.

It is an arithmetic number, because the mean of its divisors is an integer number (245707960).

Almost surely, 2^491415919 is an apocalyptic number.

491415919 is a deficient number, since it is larger than the sum of its proper divisors (1).

491415919 is an equidigital number, since it uses as much as digits as its factorization.

491415919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 43.

The square root of 491415919 is about 22167.9029003648. The cubic root of 491415919 is about 789.1321554656.

The spelling of 491415919 in words is "four hundred ninety-one million, four hundred fifteen thousand, nine hundred nineteen".