129231616 has 54 divisors (see below), whose sum is σ = 273211260. Its totient is φ = 60839424.

The previous prime is 129231607. The next prime is 129231701. The reversal of 129231616 is 616132921.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 792751 + ... + 792913.

Almost surely, 2^129231616 is an apocalyptic number.

129231616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129231616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136605630).

129231616 is an abundant number, since it is smaller than the sum of its proper divisors (143979644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129231616 is an frugal number, since it uses more digits than its factorization.

129231616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 184 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 129231616 is about 11368.0084447541. The cubic root of 129231616 is about 505.5796578901.

The spelling of 129231616 in words is "one hundred twenty-nine million, two hundred thirty-one thousand, six hundred sixteen".