491030081 has 2 divisors, whose sum is σ = 491030082. Its totient is φ = 491030080.

The previous prime is 491030039. The next prime is 491030101. The reversal of 491030081 is 180030194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429940225 + 61089856 = 20735^2 + 7816^2 .

It is a cyclic number.

It is not a de Polignac number, because 491030081 - 2⁶ = 491030017 is a prime.

It is a super-2 number, since 2×491030081² = 482221080893733122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491030081.

It is not a weakly prime, because it can be changed into another prime (491030011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245515040 + 245515041.

It is an arithmetic number, because the mean of its divisors is an integer number (245515041).

Almost surely, 2^491030081 is an apocalyptic number.

It is an amenable number.

491030081 is a deficient number, since it is larger than the sum of its proper divisors (1).

491030081 is an equidigital number, since it uses as much as digits as its factorization.

491030081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 491030081 is about 22159.1985640275. The cubic root of 491030081 is about 788.9255708578.

The spelling of 491030081 in words is "four hundred ninety-one million, thirty thousand, eighty-one".