129336431 has 12 divisors (see below), whose sum is σ = 151608600. Its totient is φ = 110008080.

The previous prime is 129336421. The next prime is 129336451. The reversal of 129336431 is 134633921.

It is not a de Polignac number, because 129336431 - 2¹⁴ = 129320047 is a prime.

It is a super-2 number, since 2×129336431² = 33455824767635522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129336421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3656 + ... + 16493.

It is an arithmetic number, because the mean of its divisors is an integer number (12634050).

Almost surely, 2^129336431 is an apocalyptic number.

129336431 is a deficient number, since it is larger than the sum of its proper divisors (22272169).

129336431 is a wasteful number, since it uses less digits than its factorization.

129336431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20294 (or 20287 counting only the distinct ones).

The product of its digits is 11664, while the sum is 32.

The square root of 129336431 is about 11372.6175966661. The cubic root of 129336431 is about 505.7163066278.

The spelling of 129336431 in words is "one hundred twenty-nine million, three hundred thirty-six thousand, four hundred thirty-one".