129561532 has 12 divisors (see below), whose sum is σ = 238666120. Its totient is φ = 61371216.

The previous prime is 129561527. The next prime is 129561533. The reversal of 129561532 is 235165921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129561533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852303 + ... + 852454.

Almost surely, 2^129561532 is an apocalyptic number.

It is an amenable number.

129561532 is a deficient number, since it is larger than the sum of its proper divisors (109104588).

129561532 is a wasteful number, since it uses less digits than its factorization.

129561532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704780 (or 1704778 counting only the distinct ones).

The product of its digits is 16200, while the sum is 34.

The square root of 129561532 is about 11382.5099165342. The cubic root of 129561532 is about 506.0095245230.

The spelling of 129561532 in words is "one hundred twenty-nine million, five hundred sixty-one thousand, five hundred thirty-two".