129561706 has 8 divisors (see below), whose sum is σ = 194396580. Its totient is φ = 64762848.

The previous prime is 129561697. The next prime is 129561721. The reversal of 129561706 is 607165921.

It can be written as a sum of positive squares in 2 ways, for example, as 128936025 + 625681 = 11355^2 + 791^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3420 + ... + 16456.

Almost surely, 2^129561706 is an apocalyptic number.

129561706 is a deficient number, since it is larger than the sum of its proper divisors (64834874).

129561706 is a wasteful number, since it uses less digits than its factorization.

129561706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18008.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 129561706 is about 11382.5175598371. The cubic root of 129561706 is about 506.0097510450.

It can be divided in two parts, 1295 and 61706, that added together give a square (63001 = 251²).

The spelling of 129561706 in words is "one hundred twenty-nine million, five hundred sixty-one thousand, seven hundred six".