129131520 has 176 divisors, whose sum is σ = 472414848. Its totient is φ = 29491200.

The previous prime is 129131491. The next prime is 129131521. The reversal of 129131520 is 25131921.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129131521) 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, 106920 + ... + 108120.

Almost surely, 2^129131520 is an apocalyptic number.

129131520 is a gapful number since it is divisible by the number (10) 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 129131520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236207424).

129131520 is an abundant number, since it is smaller than the sum of its proper divisors (343283328).

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

129131520 is a wasteful number, since it uses less digits than its factorization.

129131520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 129131520 is about 11363.6050617751. The cubic root of 129131520 is about 505.4490923873.

The spelling of 129131520 in words is "one hundred twenty-nine million, one hundred thirty-one thousand, five hundred twenty".