129436131 has 16 divisors (see below), whose sum is σ = 188477568. Its totient is φ = 78360000.

The previous prime is 129436117. The next prime is 129436133. The reversal of 129436131 is 131634921.

It is not a de Polignac number, because 129436131 - 2⁷ = 129436003 is a prime.

It is a super-2 number, since 2×129436131² = 33507424016498322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129436133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41631 + ... + 44631.

It is an arithmetic number, because the mean of its divisors is an integer number (11779848).

Almost surely, 2^129436131 is an apocalyptic number.

129436131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129436131 is a deficient number, since it is larger than the sum of its proper divisors (59041437).

129436131 is a wasteful number, since it uses less digits than its factorization.

129436131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322.

The product of its digits is 3888, while the sum is 30.

The square root of 129436131 is about 11377.0000878966. Note that the first 4 decimals coincide. The cubic root of 129436131 is about 505.8462183766.

The spelling of 129436131 in words is "one hundred twenty-nine million, four hundred thirty-six thousand, one hundred thirty-one".