129661603 has 6 divisors (see below), whose sum is σ = 135544724. Its totient is φ = 124023636.

The previous prime is 129661591. The next prime is 129661607. The reversal of 129661603 is 306166921.

It is a de Polignac number, because none of the positive numbers 2^k-129661603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129661607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122025 + ... + 123082.

Almost surely, 2^129661603 is an apocalyptic number.

129661603 is a deficient number, since it is larger than the sum of its proper divisors (5883121).

129661603 is an equidigital number, since it uses as much as digits as its factorization.

129661603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245153 (or 245130 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 129661603 is about 11386.9048911458. The cubic root of 129661603 is about 506.1397685518.

The spelling of 129661603 in words is "one hundred twenty-nine million, six hundred sixty-one thousand, six hundred three".