129572541 has 20 divisors (see below), whose sum is σ = 221211232. Its totient is φ = 74041128.

The previous prime is 129572539. The next prime is 129572543. The reversal of 129572541 is 145275921.

It is an interprime number because it is at equal distance from previous prime (129572539) and next prime (129572543).

It is not a de Polignac number, because 129572541 - 2¹ = 129572539 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 129572496 and 129572505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129572543) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 113695 + ... + 114828.

Almost surely, 2^129572541 is an apocalyptic number.

It is an amenable number.

129572541 is a deficient number, since it is larger than the sum of its proper divisors (91638691).

129572541 is an equidigital number, since it uses as much as digits as its factorization.

129572541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228542 (or 228533 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 129572541 is about 11382.9934990757. The cubic root of 129572541 is about 506.0238561974.

The spelling of 129572541 in words is "one hundred twenty-nine million, five hundred seventy-two thousand, five hundred forty-one".