129531850 has 24 divisors (see below), whose sum is σ = 275348448. Its totient is φ = 44410800.

The previous prime is 129531827. The next prime is 129531851. The reversal of 129531850 is 58135921.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (129531851) 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, 184696 + ... + 185395.

It is an arithmetic number, because the mean of its divisors is an integer number (11472852).

Almost surely, 2^129531850 is an apocalyptic number.

129531850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129531850 is an abundant number, since it is smaller than the sum of its proper divisors (145816598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129531850 is a wasteful number, since it uses less digits than its factorization.

129531850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370110 (or 370105 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 129531850 is about 11381.2059993658. The cubic root of 129531850 is about 505.9708800231.

The spelling of 129531850 in words is "one hundred twenty-nine million, five hundred thirty-one thousand, eight hundred fifty".