129542563 has 4 divisors (see below), whose sum is σ = 129629808. Its totient is φ = 129455320.

The previous prime is 129542549. The next prime is 129542593. The reversal of 129542563 is 365245921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365245921 = 3631 ⋅100591.

It is a cyclic number.

It is not a de Polignac number, because 129542563 - 2¹³ = 129534371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129542593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41356 + ... + 44377.

It is an arithmetic number, because the mean of its divisors is an integer number (32407452).

Almost surely, 2^129542563 is an apocalyptic number.

129542563 is a deficient number, since it is larger than the sum of its proper divisors (87245).

129542563 is an equidigital number, since it uses as much as digits as its factorization.

129542563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87244.

The product of its digits is 64800, while the sum is 37.

The square root of 129542563 is about 11381.6766339586. The cubic root of 129542563 is about 505.9848285015.

The spelling of 129542563 in words is "one hundred twenty-nine million, five hundred forty-two thousand, five hundred sixty-three".