129411761 has 2 divisors, whose sum is σ = 129411762. Its totient is φ = 129411760.

The previous prime is 129411757. The next prime is 129411787. The reversal of 129411761 is 167114921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119683600 + 9728161 = 10940^2 + 3119^2 .

It is an emirp because it is prime and its reverse (167114921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129411761 - 2² = 129411757 is a prime.

It is a super-2 number, since 2×129411761² = 33494807770242242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129411791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64705880 + 64705881.

It is an arithmetic number, because the mean of its divisors is an integer number (64705881).

Almost surely, 2^129411761 is an apocalyptic number.

It is an amenable number.

129411761 is a deficient number, since it is larger than the sum of its proper divisors (1).

129411761 is an equidigital number, since it uses as much as digits as its factorization.

129411761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 32.

The square root of 129411761 is about 11375.9290170078. The cubic root of 129411761 is about 505.8144697811.

The spelling of 129411761 in words is "one hundred twenty-nine million, four hundred eleven thousand, seven hundred sixty-one".