220001001 has 16 divisors (see below), whose sum is σ = 328651968. Its totient is φ = 129729600.

The previous prime is 220000997. The next prime is 220001027. The reversal of 220001001 is 100100022.

It is a happy number.

It is not a de Polignac number, because 220001001 - 2² = 220000997 is a prime.

220001001 is a modest number, since divided by 1001 gives 220 as remainder.

It is not an unprimeable number, because it can be changed into a prime (220001051) 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, 88870 + ... + 91311.

It is an arithmetic number, because the mean of its divisors is an integer number (20540748).

Almost surely, 2^220001001 is an apocalyptic number.

It is an amenable number.

220001001 is a deficient number, since it is larger than the sum of its proper divisors (108650967).

220001001 is a wasteful number, since it uses less digits than its factorization.

220001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180232.

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

The square root of 220001001 is about 14832.4307178561. The cubic root of 220001001 is about 603.6819892613.

Adding to 220001001 its reverse (100100022), we get a palindrome (320101023).

The spelling of 220001001 in words is "two hundred twenty million, one thousand, one".