129931650 has 72 divisors (see below), whose sum is σ = 351311220. Its totient is φ = 34427520.

The previous prime is 129931639. The next prime is 129931661. The reversal of 129931650 is 56139921.

129931650 is a `hidden beast` number, since 1 + 299 + 316 + 50 = 666.

It is an interprime number because it is at equal distance from previous prime (129931639) and next prime (129931661).

It can be written as a sum of positive squares in 6 ways, for example, as 79762761 + 50168889 = 8931^2 + 7083^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 77016 + ... + 78684.

Almost surely, 2^129931650 is an apocalyptic number.

129931650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129931650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175655610).

129931650 is an abundant number, since it is smaller than the sum of its proper divisors (221379570).

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

129931650 is a wasteful number, since it uses less digits than its factorization.

129931650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860 (or 1852 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 129931650 is about 11398.7565111287. The cubic root of 129931650 is about 506.4909050060.

The spelling of 129931650 in words is "one hundred twenty-nine million, nine hundred thirty-one thousand, six hundred fifty".