129241549 has 2 divisors, whose sum is σ = 129241550. Its totient is φ = 129241548.

The previous prime is 129241547. The next prime is 129241589. The reversal of 129241549 is 945142921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128981449 + 260100 = 11357^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 129241549 - 2¹ = 129241547 is a prime.

Together with 129241547, it forms a pair of twin primes.

It is equal to p_7337629 and since 129241549 and 7337629 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129241543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64620774 + 64620775.

It is an arithmetic number, because the mean of its divisors is an integer number (64620775).

Almost surely, 2^129241549 is an apocalyptic number.

It is an amenable number.

129241549 is a deficient number, since it is larger than the sum of its proper divisors (1).

129241549 is an equidigital number, since it uses as much as digits as its factorization.

129241549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 129241549 is about 11368.4453202714. The cubic root of 129241549 is about 505.5926108455.

The spelling of 129241549 in words is "one hundred twenty-nine million, two hundred forty-one thousand, five hundred forty-nine".