129601649 has 2 divisors, whose sum is σ = 129601650. Its totient is φ = 129601648.

The previous prime is 129601643. The next prime is 129601657. The reversal of 129601649 is 946106921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129049600 + 552049 = 11360^2 + 743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129601649 is a prime.

It is not a weakly prime, because it can be changed into another prime (129601643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64800824 + 64800825.

It is an arithmetic number, because the mean of its divisors is an integer number (64800825).

Almost surely, 2^129601649 is an apocalyptic number.

It is an amenable number.

129601649 is a deficient number, since it is larger than the sum of its proper divisors (1).

129601649 is an equidigital number, since it uses as much as digits as its factorization.

129601649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 129601649 is about 11384.2720013183. The cubic root of 129601649 is about 506.0617454998.

The spelling of 129601649 in words is "one hundred twenty-nine million, six hundred one thousand, six hundred forty-nine".