129761941 has 2 divisors, whose sum is σ = 129761942. Its totient is φ = 129761940.

The previous prime is 129761909. The next prime is 129761981. The reversal of 129761941 is 149167921.

It is an a-pointer prime, because the next prime (129761981) can be obtained adding 129761941 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128731716 + 1030225 = 11346^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 129761941 - 2⁵ = 129761909 is a prime.

It is a super-2 number, since 2×129761941² = 33676322664174962, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129761894 and 129761903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129761981) 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 as a sum of consecutive naturals, namely, 64880970 + 64880971.

It is an arithmetic number, because the mean of its divisors is an integer number (64880971).

Almost surely, 2^129761941 is an apocalyptic number.

It is an amenable number.

129761941 is a deficient number, since it is larger than the sum of its proper divisors (1).

129761941 is an equidigital number, since it uses as much as digits as its factorization.

129761941 is an odious number, because the sum of its binary digits is odd.

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

The square root of 129761941 is about 11391.3098895606. The cubic root of 129761941 is about 506.2702928207.

The spelling of 129761941 in words is "one hundred twenty-nine million, seven hundred sixty-one thousand, nine hundred forty-one".