2001129985 has 8 divisors (see below), whose sum is σ = 2406545280. Its totient is φ = 1597444464.

The previous prime is 2001129929. The next prime is 2001130013. The reversal of 2001129985 is 5899211002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2001129985 - 2¹⁷ = 2000998913 is a prime.

It is a super-2 number, since 2×2001129985² = 8009042433732200450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429895 + ... + 434524.

It is an arithmetic number, because the mean of its divisors is an integer number (300818160).

Almost surely, 2^2001129985 is an apocalyptic number.

It is an amenable number.

2001129985 is a deficient number, since it is larger than the sum of its proper divisors (405415295).

2001129985 is an equidigital number, since it uses as much as digits as its factorization.

2001129985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864887.

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

The square root of 2001129985 is about 44733.9913823929. The cubic root of 2001129985 is about 1260.1582872026.

The spelling of 2001129985 in words is "two billion, one million, one hundred twenty-nine thousand, nine hundred eighty-five".