129187209425 has 6 divisors (see below), whose sum is σ = 160192139718. Its totient is φ = 103349767520.

The previous prime is 129187209377. The next prime is 129187209451. The reversal of 129187209425 is 524902781921.

It can be written as a sum of positive squares in 3 ways, for example, as 188430529 + 128998778896 = 13727^2 + 359164^2 .

It is a de Polignac number, because none of the positive numbers 2^k-129187209425 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2583744164 + ... + 2583744213.

It is an arithmetic number, because the mean of its divisors is an integer number (26698689953).

Almost surely, 2^129187209425 is an apocalyptic number.

It is an amenable number.

129187209425 is a deficient number, since it is larger than the sum of its proper divisors (31004930293).

129187209425 is an equidigital number, since it uses as much as digits as its factorization.

129187209425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5167488387 (or 5167488382 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 129187209425 in words is "one hundred twenty-nine billion, one hundred eighty-seven million, two hundred nine thousand, four hundred twenty-five".