491215129 has 2 divisors, whose sum is σ = 491215130. Its totient is φ = 491215128.

The previous prime is 491215097. The next prime is 491215141. The reversal of 491215129 is 921512194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409131529 + 82083600 = 20227^2 + 9060^2 .

It is a cyclic number.

It is not a de Polignac number, because 491215129 - 2⁵ = 491215097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491215094 and 491215103.

It is not a weakly prime, because it can be changed into another prime (491215159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245607564 + 245607565.

It is an arithmetic number, because the mean of its divisors is an integer number (245607565).

Almost surely, 2^491215129 is an apocalyptic number.

It is an amenable number.

491215129 is a deficient number, since it is larger than the sum of its proper divisors (1).

491215129 is an equidigital number, since it uses as much as digits as its factorization.

491215129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 491215129 is about 22163.3735924836. The cubic root of 491215129 is about 789.0246623864.

The spelling of 491215129 in words is "four hundred ninety-one million, two hundred fifteen thousand, one hundred twenty-nine".