129887439201 has 27 divisors (see below), whose sum is σ = 203179263417. Its totient is φ = 79922082240.

The previous prime is 129887439193. The next prime is 129887439223. The reversal of 129887439201 is 102934788921.

The square root of 129887439201 is 360399.

It is a perfect power (a square), and thus also a powerful number.

129887439201 is a `hidden beast` number, since 129 + 8 + 87 + 439 + 2 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10671923025 + 119215516176 = 103305^2 + 345276^2 .

It is not a de Polignac number, because 129887439201 - 2³ = 129887439193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129887439001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 14050941 + ... + 14060181.

Almost surely, 2^129887439201 is an apocalyptic number.

129887439201 is the 360399-th square number.

129887439201 is the 180200-th centered octagonal number.

It is an amenable number.

129887439201 is a deficient number, since it is larger than the sum of its proper divisors (73291824216).

129887439201 is an frugal number, since it uses more digits than its factorization.

129887439201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18514 (or 9257 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 129887439201 in words is "one hundred twenty-nine billion, eight hundred eighty-seven million, four hundred thirty-nine thousand, two hundred one".