129987887 has 2 divisors, whose sum is σ = 129987888. Its totient is φ = 129987886.

The previous prime is 129987859. The next prime is 129987901. The reversal of 129987887 is 788789921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129987887 - 2²² = 125793583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129987587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64993943 + 64993944.

It is an arithmetic number, because the mean of its divisors is an integer number (64993944).

Almost surely, 2^129987887 is an apocalyptic number.

129987887 is a deficient number, since it is larger than the sum of its proper divisors (1).

129987887 is an equidigital number, since it uses as much as digits as its factorization.

129987887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 59.

The square root of 129987887 is about 11401.2230484277. The cubic root of 129987887 is about 506.5639675754.

It can be divided in two parts, 12 and 9987887, that added together give a palindrome (9987899).

The spelling of 129987887 in words is "one hundred twenty-nine million, nine hundred eighty-seven thousand, eight hundred eighty-seven".