129724459 has 2 divisors, whose sum is σ = 129724460. Its totient is φ = 129724458.

The previous prime is 129724403. The next prime is 129724471. The reversal of 129724459 is 954427921.

It is a strong prime.

It is an emirp because it is prime and its reverse (954427921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129724459 - 2¹³ = 129716267 is a prime.

It is not a weakly prime, because it can be changed into another prime (129724489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64862229 + 64862230.

It is an arithmetic number, because the mean of its divisors is an integer number (64862230).

Almost surely, 2^129724459 is an apocalyptic number.

129724459 is a deficient number, since it is larger than the sum of its proper divisors (1).

129724459 is an equidigital number, since it uses as much as digits as its factorization.

129724459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 129724459 is about 11389.6645692487. The cubic root of 129724459 is about 506.2215423926.

The spelling of 129724459 in words is "one hundred twenty-nine million, seven hundred twenty-four thousand, four hundred fifty-nine".