129241687 has 2 divisors, whose sum is σ = 129241688. Its totient is φ = 129241686.

The previous prime is 129241621. The next prime is 129241711. The reversal of 129241687 is 786142921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129241687 - 2²³ = 120853079 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129241787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64620843 + 64620844.

It is an arithmetic number, because the mean of its divisors is an integer number (64620844).

Almost surely, 2^129241687 is an apocalyptic number.

129241687 is a deficient number, since it is larger than the sum of its proper divisors (1).

129241687 is an equidigital number, since it uses as much as digits as its factorization.

129241687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 129241687 is about 11368.4513897012. The cubic root of 129241687 is about 505.5927907974.

The spelling of 129241687 in words is "one hundred twenty-nine million, two hundred forty-one thousand, six hundred eighty-seven".