129717647 has 2 divisors, whose sum is σ = 129717648. Its totient is φ = 129717646.

The previous prime is 129717619. The next prime is 129717661. The reversal of 129717647 is 746717921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129717647 - 2⁶ = 129717583 is a prime.

It is a super-3 number, since 3×129717647³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129717598 and 129717607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129717347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64858823 + 64858824.

It is an arithmetic number, because the mean of its divisors is an integer number (64858824).

Almost surely, 2^129717647 is an apocalyptic number.

129717647 is a deficient number, since it is larger than the sum of its proper divisors (1).

129717647 is an equidigital number, since it uses as much as digits as its factorization.

129717647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 44.

The square root of 129717647 is about 11389.3655222756. The cubic root of 129717647 is about 506.2126814538.

The spelling of 129717647 in words is "one hundred twenty-nine million, seven hundred seventeen thousand, six hundred forty-seven".