129702217 has 2 divisors, whose sum is σ = 129702218. Its totient is φ = 129702216.

The previous prime is 129702211. The next prime is 129702241. The reversal of 129702217 is 712207921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82519056 + 47183161 = 9084^2 + 6869^2 .

It is a cyclic number.

It is not a de Polignac number, because 129702217 - 2¹⁹ = 129177929 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129702211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64851108 + 64851109.

It is an arithmetic number, because the mean of its divisors is an integer number (64851109).

Almost surely, 2^129702217 is an apocalyptic number.

It is an amenable number.

129702217 is a deficient number, since it is larger than the sum of its proper divisors (1).

129702217 is an equidigital number, since it uses as much as digits as its factorization.

129702217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 129702217 is about 11388.6881158455. The cubic root of 129702217 is about 506.1926092133.

The spelling of 129702217 in words is "one hundred twenty-nine million, seven hundred two thousand, two hundred seventeen".