129338231 has 36 divisors (see below), whose sum is σ = 155692992. Its totient is φ = 107184000.

The previous prime is 129338129. The next prime is 129338243. The reversal of 129338231 is 132833921.

It is not a de Polignac number, because 129338231 - 2²² = 125143927 is a prime.

It is a super-2 number, since 2×129338231² = 33456755996418722, 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 (129338291) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3154571 + ... + 3154611.

Almost surely, 2^129338231 is an apocalyptic number.

129338231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129338231 is a deficient number, since it is larger than the sum of its proper divisors (26354761).

129338231 is a wasteful number, since it uses less digits than its factorization.

129338231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 112 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 129338231 is about 11372.6967338446. The cubic root of 129338231 is about 505.7186526673.

The spelling of 129338231 in words is "one hundred twenty-nine million, three hundred thirty-eight thousand, two hundred thirty-one".