129757049 has 12 divisors (see below), whose sum is σ = 135113004. Its totient is φ = 124606272.

The previous prime is 129757027. The next prime is 129757057. The reversal of 129757049 is 940757921.

It can be written as a sum of positive squares in 6 ways, for example, as 19360000 + 110397049 = 4400^2 + 10507^2 .

It is a de Polignac number, because none of the positive numbers 2^k-129757049 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129757009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232679 + ... + 233235.

It is an arithmetic number, because the mean of its divisors is an integer number (11259417).

Almost surely, 2^129757049 is an apocalyptic number.

It is an amenable number.

129757049 is a deficient number, since it is larger than the sum of its proper divisors (5355955).

129757049 is an equidigital number, since it uses as much as digits as its factorization.

129757049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 129757049 is about 11391.0951624504. The cubic root of 129757049 is about 506.2639306434.

The spelling of 129757049 in words is "one hundred twenty-nine million, seven hundred fifty-seven thousand, forty-nine".