129561748 has 6 divisors (see below), whose sum is σ = 226733066. Its totient is φ = 64780872.

The previous prime is 129561739. The next prime is 129561749. The reversal of 129561748 is 847165921.

It can be written as a sum of positive squares in only one way, i.e., 126832644 + 2729104 = 11262^2 + 1652^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129561749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16195215 + ... + 16195222.

Almost surely, 2^129561748 is an apocalyptic number.

It is an amenable number.

129561748 is a deficient number, since it is larger than the sum of its proper divisors (97171318).

129561748 is a wasteful number, since it uses less digits than its factorization.

129561748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32390441 (or 32390439 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 129561748 is about 11382.5194047715. The cubic root of 129561748 is about 506.0098057227.

The spelling of 129561748 in words is "one hundred twenty-nine million, five hundred sixty-one thousand, seven hundred forty-eight".