129991158 has 48 divisors (see below), whose sum is σ = 308385792. Its totient is φ = 39246000.

The previous prime is 129991157. The next prime is 129991159. The reversal of 129991158 is 851199921.

It is an interprime number because it is at equal distance from previous prime (129991157) and next prime (129991159).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129991157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60523 + ... + 62633.

It is an arithmetic number, because the mean of its divisors is an integer number (6424704).

Almost surely, 2^129991158 is an apocalyptic number.

129991158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129991158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154192896).

129991158 is an abundant number, since it is smaller than the sum of its proper divisors (178394634).

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

129991158 is a wasteful number, since it uses less digits than its factorization.

129991158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441 (or 2438 counting only the distinct ones).

The product of its digits is 58320, while the sum is 45.

The square root of 129991158 is about 11401.3664970476. The cubic root of 129991158 is about 506.5682165786.

The spelling of 129991158 in words is "one hundred twenty-nine million, nine hundred ninety-one thousand, one hundred fifty-eight".