129961550 has 12 divisors (see below), whose sum is σ = 241728576. Its totient is φ = 51984600.

The previous prime is 129961543. The next prime is 129961597. The reversal of 129961550 is 55169921.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

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 5 ways as a sum of consecutive naturals, for example, 1299566 + ... + 1299665.

It is an arithmetic number, because the mean of its divisors is an integer number (20144048).

Almost surely, 2^129961550 is an apocalyptic number.

129961550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129961550 is a deficient number, since it is larger than the sum of its proper divisors (111767026).

129961550 is a wasteful number, since it uses less digits than its factorization.

129961550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599243 (or 2599238 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 129961550 is about 11400.0679822534. The cubic root of 129961550 is about 506.5297534224.

The spelling of 129961550 in words is "one hundred twenty-nine million, nine hundred sixty-one thousand, five hundred fifty".