129131263 has 4 divisors (see below), whose sum is σ = 132280848. Its totient is φ = 125981680.

The previous prime is 129131237. The next prime is 129131281. The reversal of 129131263 is 362131921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129131263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129131293) 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, 1574731 + ... + 1574812.

It is an arithmetic number, because the mean of its divisors is an integer number (33070212).

Almost surely, 2^129131263 is an apocalyptic number.

129131263 is a deficient number, since it is larger than the sum of its proper divisors (3149585).

129131263 is an equidigital number, since it uses as much as digits as its factorization.

129131263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149584.

The product of its digits is 1944, while the sum is 28.

The square root of 129131263 is about 11363.5937537383. The cubic root of 129131263 is about 505.4487570689.

The spelling of 129131263 in words is "one hundred twenty-nine million, one hundred thirty-one thousand, two hundred sixty-three".