129651550 has 36 divisors (see below), whose sum is σ = 280528920. Its totient is φ = 44451120.

The previous prime is 129651541. The next prime is 129651583. The reversal of 129651550 is 55156921.

129651550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24010 + ... + 28909.

It is an arithmetic number, because the mean of its divisors is an integer number (7792470).

Almost surely, 2^129651550 is an apocalyptic number.

129651550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129651550 is an abundant number, since it is smaller than the sum of its proper divisors (150877370).

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

129651550 is a wasteful number, since it uses less digits than its factorization.

129651550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52945 (or 52933 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 34.

The square root of 129651550 is about 11386.4634544708. The cubic root of 129651550 is about 506.1266874378.

The spelling of 129651550 in words is "one hundred twenty-nine million, six hundred fifty-one thousand, five hundred fifty".