129548161 has 2 divisors, whose sum is σ = 129548162. Its totient is φ = 129548160.

The previous prime is 129548149. The next prime is 129548179. The reversal of 129548161 is 161845921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89415936 + 40132225 = 9456^2 + 6335^2 .

It is a cyclic number.

It is not a de Polignac number, because 129548161 - 2⁷ = 129548033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129548161.

It is not a weakly prime, because it can be changed into another prime (129548131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64774080 + 64774081.

It is an arithmetic number, because the mean of its divisors is an integer number (64774081).

Almost surely, 2^129548161 is an apocalyptic number.

It is an amenable number.

129548161 is a deficient number, since it is larger than the sum of its proper divisors (1).

129548161 is an equidigital number, since it uses as much as digits as its factorization.

129548161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 129548161 is about 11381.9225528906. The cubic root of 129548161 is about 505.9921168712.

It can be divided in two parts, 12954 and 8161, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 129548161 in words is "one hundred twenty-nine million, five hundred forty-eight thousand, one hundred sixty-one".