129487249 has 4 divisors (see below), whose sum is σ = 137104164. Its totient is φ = 121870336.

The previous prime is 129487247. The next prime is 129487271. The reversal of 129487249 is 942784921.

129487249 = 1935² + 1936² + ... + 1968².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56896849 + 72590400 = 7543^2 + 8520^2 .

It is a cyclic number.

It is not a de Polignac number, because 129487249 - 2¹ = 129487247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129487199 and 129487208.

It is not an unprimeable number, because it can be changed into a prime (129487247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3808432 + ... + 3808465.

It is an arithmetic number, because the mean of its divisors is an integer number (34276041).

Almost surely, 2^129487249 is an apocalyptic number.

It is an amenable number.

129487249 is a deficient number, since it is larger than the sum of its proper divisors (7616915).

129487249 is an equidigital number, since it uses as much as digits as its factorization.

129487249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7616914.

The product of its digits is 290304, while the sum is 46.

The square root of 129487249 is about 11379.2464161736. The cubic root of 129487249 is about 505.9128006194.

It can be divided in two parts, 1294872 and 49, that added together give a palindrome (1294921).

The spelling of 129487249 in words is "one hundred twenty-nine million, four hundred eighty-seven thousand, two hundred forty-nine".