491707081 has 2 divisors, whose sum is σ = 491707082. Its totient is φ = 491707080.

The previous prime is 491707039. The next prime is 491707103. The reversal of 491707081 is 180707194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486599481 + 5107600 = 22059^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 491707081 - 2⁹ = 491706569 is a prime.

It is a super-2 number, since 2×491707081² = 483551707011081122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491707081.

It is not a weakly prime, because it can be changed into another prime (491707681) 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, 245853540 + 245853541.

It is an arithmetic number, because the mean of its divisors is an integer number (245853541).

Almost surely, 2^491707081 is an apocalyptic number.

It is an amenable number.

491707081 is a deficient number, since it is larger than the sum of its proper divisors (1).

491707081 is an equidigital number, since it uses as much as digits as its factorization.

491707081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 491707081 is about 22174.4691255507. The cubic root of 491707081 is about 789.2879772616.

The spelling of 491707081 in words is "four hundred ninety-one million, seven hundred seven thousand, eighty-one".