129029987 has 2 divisors, whose sum is σ = 129029988. Its totient is φ = 129029986.

The previous prime is 129029981. The next prime is 129030001. The reversal of 129029987 is 789920921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129029987 - 2¹² = 129025891 is a prime.

It is not a weakly prime, because it can be changed into another prime (129029981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64514993 + 64514994.

It is an arithmetic number, because the mean of its divisors is an integer number (64514994).

Almost surely, 2^129029987 is an apocalyptic number.

129029987 is a deficient number, since it is larger than the sum of its proper divisors (1).

129029987 is an equidigital number, since it uses as much as digits as its factorization.

129029987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 129029987 is about 11359.1367189589. The cubic root of 129029987 is about 505.3165835078.

The spelling of 129029987 in words is "one hundred twenty-nine million, twenty-nine thousand, nine hundred eighty-seven".