491409071 has 2 divisors, whose sum is σ = 491409072. Its totient is φ = 491409070.

The previous prime is 491409049. The next prime is 491409077. The reversal of 491409071 is 170904194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491409071 - 2¹⁸ = 491146927 is a prime.

It is a super-2 number, since 2×491409071² = 482965750122166082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491409077) 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, 245704535 + 245704536.

It is an arithmetic number, because the mean of its divisors is an integer number (245704536).

Almost surely, 2^491409071 is an apocalyptic number.

491409071 is a deficient number, since it is larger than the sum of its proper divisors (1).

491409071 is an equidigital number, since it uses as much as digits as its factorization.

491409071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 491409071 is about 22167.7484422753. The cubic root of 491409071 is about 789.1284898660.

The spelling of 491409071 in words is "four hundred ninety-one million, four hundred nine thousand, seventy-one".