129047761 has 8 divisors (see below), whose sum is σ = 133710848. Its totient is φ = 124416000.

The previous prime is 129047741. The next prime is 129047777. The reversal of 129047761 is 167740921.

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

It is a 3-Lehmer number, since φ(129047761) divides (129047761-1)³.

It is a cyclic number.

It is not a de Polignac number, because 129047761 - 2⁵ = 129047729 is a prime.

It is a super-2 number, since 2×129047761² = 33306649238226242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129047761.

It is not an unprimeable number, because it can be changed into a prime (129047741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721 + ... + 16081.

It is an arithmetic number, because the mean of its divisors is an integer number (16713856).

Almost surely, 2^129047761 is an apocalyptic number.

It is an amenable number.

129047761 is a deficient number, since it is larger than the sum of its proper divisors (4663087).

129047761 is a wasteful number, since it uses less digits than its factorization.

129047761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15663.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 129047761 is about 11359.9190578102. The cubic root of 129047761 is about 505.3397850513.

The spelling of 129047761 in words is "one hundred twenty-nine million, forty-seven thousand, seven hundred sixty-one".