1220109985 has 16 divisors (see below), whose sum is σ = 1542288960. Its totient is φ = 924056640.

The previous prime is 1220109973. The next prime is 1220109991. The reversal of 1220109985 is 5899010221.

It is not a de Polignac number, because 1220109985 - 2¹¹ = 1220107937 is a prime.

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, 160930 + ... + 168340.

It is an arithmetic number, because the mean of its divisors is an integer number (96393060).

Almost surely, 2^1220109985 is an apocalyptic number.

It is an amenable number.

1220109985 is a deficient number, since it is larger than the sum of its proper divisors (322178975).

1220109985 is a wasteful number, since it uses less digits than its factorization.

1220109985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9168.

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

The square root of 1220109985 is about 34930.0727883582. The cubic root of 1220109985 is about 1068.5618390863.

The spelling of 1220109985 in words is "one billion, two hundred twenty million, one hundred nine thousand, nine hundred eighty-five".