129551528 has 8 divisors (see below), whose sum is σ = 242909130. Its totient is φ = 64775760.

The previous prime is 129551501. The next prime is 129551531. The reversal of 129551528 is 825155921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 92121604 + 37429924 = 9598^2 + 6118^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 129551491 and 129551500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8096963 + ... + 8096978.

Almost surely, 2^129551528 is an apocalyptic number.

It is an amenable number.

129551528 is a deficient number, since it is larger than the sum of its proper divisors (113357602).

129551528 is a wasteful number, since it uses less digits than its factorization.

129551528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16193947 (or 16193943 counting only the distinct ones).

The product of its digits is 36000, while the sum is 38.

The square root of 129551528 is about 11382.0704619151. The cubic root of 129551528 is about 505.9965004679.

The spelling of 129551528 in words is "one hundred twenty-nine million, five hundred fifty-one thousand, five hundred twenty-eight".