129487049 has 2 divisors, whose sum is σ = 129487050. Its totient is φ = 129487048.

The previous prime is 129487019. The next prime is 129487051. The reversal of 129487049 is 940784921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126787600 + 2699449 = 11260^2 + 1643^2 .

It is an emirp because it is prime and its reverse (940784921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129487049 - 2⁸ = 129486793 is a prime.

Together with 129487051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129487009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64743524 + 64743525.

It is an arithmetic number, because the mean of its divisors is an integer number (64743525).

Almost surely, 2^129487049 is an apocalyptic number.

It is an amenable number.

129487049 is a deficient number, since it is larger than the sum of its proper divisors (1).

129487049 is an equidigital number, since it uses as much as digits as its factorization.

129487049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 129487049 is about 11379.2376282421. The cubic root of 129487049 is about 505.9125401495.

The spelling of 129487049 in words is "one hundred twenty-nine million, four hundred eighty-seven thousand, forty-nine".