129187079 has 6 divisors (see below), whose sum is σ = 150278904. Its totient is φ = 110731740.

The previous prime is 129187073. The next prime is 129187087. The reversal of 129187079 is 970781921.

It is a de Polignac number, because none of the positive numbers 2^k-129187079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129187073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1318187 + ... + 1318284.

It is an arithmetic number, because the mean of its divisors is an integer number (25046484).

Almost surely, 2^129187079 is an apocalyptic number.

129187079 is a deficient number, since it is larger than the sum of its proper divisors (21091825).

129187079 is an equidigital number, since it uses as much as digits as its factorization.

129187079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636485 (or 2636478 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 129187079 is about 11366.0494016171. The cubic root of 129187079 is about 505.5215720308.

The spelling of 129187079 in words is "one hundred twenty-nine million, one hundred eighty-seven thousand, seventy-nine".