129550 has 12 divisors (see below), whose sum is σ = 241056. Its totient is φ = 51800.

The previous prime is 129539. The next prime is 129553. The reversal of 129550 is 55921.

It is a super-5 number, since 5×129550⁵ (a number of 27 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1246 + ... + 1345.

It is an arithmetic number, because the mean of its divisors is an integer number (20088).

129550 is a Friedman number, since it can be written as 25910*5, using all its digits and the basic arithmetic operations.

2¹²⁹⁵⁵⁰ is an apocalyptic number.

129550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129550 is a deficient number, since it is larger than the sum of its proper divisors (111506).

129550 is a wasteful number, since it uses less digits than its factorization.

129550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603 (or 2598 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 129550 is about 359.9305488563. The cubic root of 129550 is about 50.5994511129.

The spelling of 129550 in words is "one hundred twenty-nine thousand, five hundred fifty".