491163289 has 2 divisors, whose sum is σ = 491163290. Its totient is φ = 491163288.

The previous prime is 491163241. The next prime is 491163293. The reversal of 491163289 is 982361194.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380913289 + 110250000 = 19517^2 + 10500^2 .

It is a cyclic number.

It is not a de Polignac number, because 491163289 - 2¹³ = 491155097 is a prime.

It is a super-2 number, since 2×491163289² = 482482752922595042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491163209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245581644 + 245581645.

It is an arithmetic number, because the mean of its divisors is an integer number (245581645).

Almost surely, 2^491163289 is an apocalyptic number.

It is an amenable number.

491163289 is a deficient number, since it is larger than the sum of its proper divisors (1).

491163289 is an equidigital number, since it uses as much as digits as its factorization.

491163289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 491163289 is about 22162.2040645781. The cubic root of 491163289 is about 788.9969050454.

The spelling of 491163289 in words is "four hundred ninety-one million, one hundred sixty-three thousand, two hundred eighty-nine".