129331731 has 8 divisors (see below), whose sum is σ = 172535040. Its totient is φ = 86174792.

The previous prime is 129331729. The next prime is 129331739. The reversal of 129331731 is 137133921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129331731 - 2¹ = 129331729 is a prime.

It is a super-2 number, since 2×129331731² = 33453393286912722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129331739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4455 + ... + 16688.

It is an arithmetic number, because the mean of its divisors is an integer number (21566880).

Almost surely, 2^129331731 is an apocalyptic number.

129331731 is a deficient number, since it is larger than the sum of its proper divisors (43203309).

129331731 is a wasteful number, since it uses less digits than its factorization.

129331731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23185.

The product of its digits is 3402, while the sum is 30.

The square root of 129331731 is about 11372.4109581038. The cubic root of 129331731 is about 505.7101807554.

The spelling of 129331731 in words is "one hundred twenty-nine million, three hundred thirty-one thousand, seven hundred thirty-one".