129555850 has 24 divisors (see below), whose sum is σ = 245525580. Its totient is φ = 50843520.

The previous prime is 129555821. The next prime is 129555857. The reversal of 129555850 is 58555921.

It can be written as a sum of positive squares in 6 ways, for example, as 67256401 + 62299449 = 8201^2 + 7893^2 .

It is not an unprimeable number, because it can be changed into a prime (129555857) 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, 21795 + ... + 27094.

Almost surely, 2^129555850 is an apocalyptic number.

129555850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129555850 is a deficient number, since it is larger than the sum of its proper divisors (115969730).

129555850 is a wasteful number, since it uses less digits than its factorization.

129555850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48954 (or 48949 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 40.

The square root of 129555850 is about 11382.2603203406. The cubic root of 129555850 is about 506.0021272961.

The spelling of 129555850 in words is "one hundred twenty-nine million, five hundred fifty-five thousand, eight hundred fifty".