129499552 has 72 divisors (see below), whose sum is σ = 319440996. Its totient is φ = 51222528.

The previous prime is 129499547. The next prime is 129499583. The reversal of 129499552 is 255994921.

It can be written as a sum of positive squares in 2 ways, for example, as 123565456 + 5934096 = 11116^2 + 2436^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17208 + ... + 23560.

Almost surely, 2^129499552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129499552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159720498).

129499552 is an abundant number, since it is smaller than the sum of its proper divisors (189941444).

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

129499552 is a wasteful number, since it uses less digits than its factorization.

129499552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6390 (or 6375 counting only the distinct ones).

The product of its digits is 291600, while the sum is 46.

The square root of 129499552 is about 11379.7869927341. The cubic root of 129499552 is about 505.9288229128.

The spelling of 129499552 in words is "one hundred twenty-nine million, four hundred ninety-nine thousand, five hundred fifty-two".