129642543 has 6 divisors (see below), whose sum is σ = 187261464. Its totient is φ = 86428356.

The previous prime is 129642503. The next prime is 129642547. The reversal of 129642543 is 345246921.

It is a happy number.

129642543 is a `hidden beast` number, since 1 + 2 + 9 + 642 + 5 + 4 + 3 = 666.

It is not a de Polignac number, because 129642543 - 2⁶ = 129642479 is a prime.

It is a super-4 number, since 4×129642543⁴ (a number of 34 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129642498 and 129642507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129642547) 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, 7202355 + ... + 7202372.

It is an arithmetic number, because the mean of its divisors is an integer number (31210244).

Almost surely, 2^129642543 is an apocalyptic number.

129642543 is a deficient number, since it is larger than the sum of its proper divisors (57618921).

129642543 is a wasteful number, since it uses less digits than its factorization.

129642543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14404733 (or 14404730 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 129642543 is about 11386.0679341026. The cubic root of 129642543 is about 506.1149668204.

The spelling of 129642543 in words is "one hundred twenty-nine million, six hundred forty-two thousand, five hundred forty-three".