129941761 has 4 divisors (see below), whose sum is σ = 137585412. Its totient is φ = 122298112.

The previous prime is 129941737. The next prime is 129941767. The reversal of 129941761 is 167149921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 167149921 = 89 ⋅1878089.

It can be written as a sum of positive squares in 2 ways, for example, as 83156161 + 46785600 = 9119^2 + 6840^2 .

It is a cyclic number.

It is not a de Polignac number, because 129941761 - 2⁷ = 129941633 is a prime.

It is a super-2 number, since 2×129941761² = 33769722503562242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129941767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3821800 + ... + 3821833.

It is an arithmetic number, because the mean of its divisors is an integer number (34396353).

Almost surely, 2^129941761 is an apocalyptic number.

It is an amenable number.

129941761 is a deficient number, since it is larger than the sum of its proper divisors (7643651).

129941761 is an equidigital number, since it uses as much as digits as its factorization.

129941761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7643650.

The product of its digits is 27216, while the sum is 40.

The square root of 129941761 is about 11399.2000157906. The cubic root of 129941761 is about 506.5040426741.

The spelling of 129941761 in words is "one hundred twenty-nine million, nine hundred forty-one thousand, seven hundred sixty-one".