129201985 has 12 divisors (see below), whose sum is σ = 170419284. Its totient is φ = 93964640.

The previous prime is 129201979. The next prime is 129201991. The reversal of 129201985 is 589102921.

It is an interprime number because it is at equal distance from previous prime (129201979) and next prime (129201991).

It can be written as a sum of positive squares in 2 ways, for example, as 71927361 + 57274624 = 8481^2 + 7568^2 .

It is not a de Polignac number, because 129201985 - 2⁷ = 129201857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106174 + ... + 107383.

It is an arithmetic number, because the mean of its divisors is an integer number (14201607).

Almost surely, 2^129201985 is an apocalyptic number.

It is an amenable number.

129201985 is a deficient number, since it is larger than the sum of its proper divisors (41217299).

129201985 is a wasteful number, since it uses less digits than its factorization.

129201985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213584 (or 213573 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 129201985 is about 11366.7051074619. The cubic root of 129201985 is about 505.5410141577.

The spelling of 129201985 in words is "one hundred twenty-nine million, two hundred one thousand, nine hundred eighty-five".