1220000001 has 16 divisors (see below), whose sum is σ = 1822507968. Its totient is φ = 719409600.

The previous prime is 1219999993. The next prime is 1220000027. The reversal of 1220000001 is 1000000221.

It is a happy number.

It is not a de Polignac number, because 1220000001 - 2³ = 1219999993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220005001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498370 + ... + 500811.

It is an arithmetic number, because the mean of its divisors is an integer number (113906748).

Almost surely, 2^1220000001 is an apocalyptic number.

1220000001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220000001 is a deficient number, since it is larger than the sum of its proper divisors (602507967).

1220000001 is a wasteful number, since it uses less digits than its factorization.

1220000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999232.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1220000001 is about 34928.4984074609. The cubic root of 1220000001 is about 1068.5297304408.

Adding to 1220000001 its reverse (1000000221), we get a palindrome (2220000222).

The spelling of 1220000001 in words is "one billion, two hundred twenty million, one", and thus it is an aban number.