129487851 has 12 divisors (see below), whose sum is σ = 190567728. Its totient is φ = 84696144.

The previous prime is 129487847. The next prime is 129487859. The reversal of 129487851 is 158784921.

It is not a de Polignac number, because 129487851 - 2² = 129487847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129487797 and 129487806.

It is not an unprimeable number, because it can be changed into a prime (129487859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135255 + ... + 136208.

It is an arithmetic number, because the mean of its divisors is an integer number (15880644).

Almost surely, 2^129487851 is an apocalyptic number.

129487851 is a deficient number, since it is larger than the sum of its proper divisors (61079877).

129487851 is a wasteful number, since it uses less digits than its factorization.

129487851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271522 (or 271519 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 129487851 is about 11379.2728678066. The cubic root of 129487851 is about 505.9135846324.

It can be divided in two parts, 1294878 and 51, that multiplied together give a triangular number (66038778 = T₁₁₄₉₂).

The spelling of 129487851 in words is "one hundred twenty-nine million, four hundred eighty-seven thousand, eight hundred fifty-one".