1220002001 has 4 divisors (see below), whose sum is σ = 1220316912. Its totient is φ = 1219687092.

The previous prime is 1220001973. The next prime is 1220002019. The reversal of 1220002001 is 1002000221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220002001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220002001.

It is not an unprimeable number, because it can be changed into a prime (1220002031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151571 + ... + 159416.

It is an arithmetic number, because the mean of its divisors is an integer number (305079228).

Almost surely, 2^1220002001 is an apocalyptic number.

It is an amenable number.

1220002001 is a deficient number, since it is larger than the sum of its proper divisors (314911).

1220002001 is an equidigital number, since it uses as much as digits as its factorization.

1220002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314910.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1220002001 is about 34928.5270373659. The cubic root of 1220002001 is about 1068.5303143365.

Adding to 1220002001 its reverse (1002000221), we get a palindrome (2222002222).

The spelling of 1220002001 in words is "one billion, two hundred twenty million, two thousand, one".