709531217 has 2 divisors, whose sum is σ = 709531218. Its totient is φ = 709531216.

The previous prime is 709531213. The next prime is 709531219. The reversal of 709531217 is 712135907.

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., 686911681 + 22619536 = 26209^2 + 4756^2 .

It is a cyclic number.

It is not a de Polignac number, because 709531217 - 2² = 709531213 is a prime.

Together with 709531219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (709531213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354765608 + 354765609.

It is an arithmetic number, because the mean of its divisors is an integer number (354765609).

Almost surely, 2^709531217 is an apocalyptic number.

It is an amenable number.

709531217 is a deficient number, since it is larger than the sum of its proper divisors (1).

709531217 is an equidigital number, since it uses as much as digits as its factorization.

709531217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13230, while the sum is 35.

The square root of 709531217 is about 26637.0271802241. The cubic root of 709531217 is about 891.9157559007.

The spelling of 709531217 in words is "seven hundred nine million, five hundred thirty-one thousand, two hundred seventeen".