1201009985 has 16 divisors (see below), whose sum is σ = 1654496256. Its totient is φ = 819851328.

The previous prime is 1201009963. The next prime is 1201010003. The reversal of 1201009985 is 5899001021.

It is a cyclic number.

It is not a de Polignac number, because 1201009985 - 2¹⁰ = 1201008961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69134 + ... + 84743.

It is an arithmetic number, because the mean of its divisors is an integer number (103406016).

Almost surely, 2^1201009985 is an apocalyptic number.

It is an amenable number.

1201009985 is a deficient number, since it is larger than the sum of its proper divisors (453486271).

1201009985 is a wasteful number, since it uses less digits than its factorization.

1201009985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154112.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 1201009985 is about 34655.5909630755. The cubic root of 1201009985 is about 1062.9566159183.

The spelling of 1201009985 in words is "one billion, two hundred one million, nine thousand, nine hundred eighty-five".