129988501 has 6 divisors (see below), whose sum is σ = 130878006. Its totient is φ = 129105000.

The previous prime is 129988493. The next prime is 129988513. The reversal of 129988501 is 105889921.

It can be written as a sum of positive squares in only one way, i.e., 124858276 + 5130225 = 11174^2 + 2265^2 .

It is not a de Polignac number, because 129988501 - 2³ = 129988493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129988531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19951 + ... + 25651.

It is an arithmetic number, because the mean of its divisors is an integer number (21813001).

Almost surely, 2^129988501 is an apocalyptic number.

129988501 is the 5701-st decagonal number.

It is an amenable number.

129988501 is a deficient number, since it is larger than the sum of its proper divisors (889505).

129988501 is an frugal number, since it uses more digits than its factorization.

129988501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6003 (or 5852 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 129988501 is about 11401.2499753317. The cubic root of 129988501 is about 506.5647651620.

The spelling of 129988501 in words is "one hundred twenty-nine million, nine hundred eighty-eight thousand, five hundred one".