129487271 has 2 divisors, whose sum is σ = 129487272. Its totient is φ = 129487270.

The previous prime is 129487247. The next prime is 129487273. The reversal of 129487271 is 172784921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129487271 is a prime.

Together with 129487273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129487273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64743635 + 64743636.

It is an arithmetic number, because the mean of its divisors is an integer number (64743636).

Almost surely, 2^129487271 is an apocalyptic number.

129487271 is a deficient number, since it is larger than the sum of its proper divisors (1).

129487271 is an equidigital number, since it uses as much as digits as its factorization.

129487271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 129487271 is about 11379.2473828457. The cubic root of 129487271 is about 505.9128292711.

The spelling of 129487271 in words is "one hundred twenty-nine million, four hundred eighty-seven thousand, two hundred seventy-one".