491807369 has 2 divisors, whose sum is σ = 491807370. Its totient is φ = 491807368.

The previous prime is 491807357. The next prime is 491807443. The reversal of 491807369 is 963708194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459544969 + 32262400 = 21437^2 + 5680^2 .

It is a cyclic number.

It is not a de Polignac number, because 491807369 - 2²⁸ = 223371913 is a prime.

It is a super-2 number, since 2×491807369² = 483748976405404322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (491807339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245903684 + 245903685.

It is an arithmetic number, because the mean of its divisors is an integer number (245903685).

Almost surely, 2^491807369 is an apocalyptic number.

It is an amenable number.

491807369 is a deficient number, since it is larger than the sum of its proper divisors (1).

491807369 is an equidigital number, since it uses as much as digits as its factorization.

491807369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 491807369 is about 22176.7303496255. The cubic root of 491807369 is about 789.3416343641.

The spelling of 491807369 in words is "four hundred ninety-one million, eight hundred seven thousand, three hundred sixty-nine".