491215097 has 2 divisors, whose sum is σ = 491215098. Its totient is φ = 491215096.

The previous prime is 491215093. The next prime is 491215129. The reversal of 491215097 is 790512194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406869241 + 84345856 = 20171^2 + 9184^2 .

It is a cyclic number.

It is not a de Polignac number, because 491215097 - 2² = 491215093 is a prime.

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 491215097.

It is not a weakly prime, because it can be changed into another prime (491215091) 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, 245607548 + 245607549.

It is an arithmetic number, because the mean of its divisors is an integer number (245607549).

Almost surely, 2^491215097 is an apocalyptic number.

It is an amenable number.

491215097 is a deficient number, since it is larger than the sum of its proper divisors (1).

491215097 is an equidigital number, since it uses as much as digits as its factorization.

491215097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 491215097 is about 22163.3728705718. The cubic root of 491215097 is about 789.0246452528.

The spelling of 491215097 in words is "four hundred ninety-one million, two hundred fifteen thousand, ninety-seven".