130720217 has 2 divisors, whose sum is σ = 130720218. Its totient is φ = 130720216.

The previous prime is 130720193. The next prime is 130720229. The reversal of 130720217 is 712027031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120582361 + 10137856 = 10981^2 + 3184^2 .

It is a cyclic number.

It is not a de Polignac number, because 130720217 - 2⁶ = 130720153 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 130720192 and 130720201.

It is not a weakly prime, because it can be changed into another prime (130720267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65360108 + 65360109.

It is an arithmetic number, because the mean of its divisors is an integer number (65360109).

Almost surely, 2^130720217 is an apocalyptic number.

It is an amenable number.

130720217 is a deficient number, since it is larger than the sum of its proper divisors (1).

130720217 is an equidigital number, since it uses as much as digits as its factorization.

130720217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 130720217 is about 11433.2942321975. The cubic root of 130720217 is about 507.5134855307.

Adding to 130720217 its reverse (712027031), we get a palindrome (842747248).

The spelling of 130720217 in words is "one hundred thirty million, seven hundred twenty thousand, two hundred seventeen".