220201001 has 4 divisors (see below), whose sum is σ = 220409604. Its totient is φ = 219992400.

The previous prime is 220200997. The next prime is 220201019. The reversal of 220201001 is 100102022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 175297600 + 44903401 = 13240^2 + 6701^2 .

It is a cyclic number.

It is not a de Polignac number, because 220201001 - 2² = 220200997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 220201001.

It is not an unprimeable number, because it can be changed into a prime (220201081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102710 + ... + 104831.

It is an arithmetic number, because the mean of its divisors is an integer number (55102401).

Almost surely, 2^220201001 is an apocalyptic number.

It is an amenable number.

220201001 is a deficient number, since it is larger than the sum of its proper divisors (208603).

220201001 is a wasteful number, since it uses less digits than its factorization.

220201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208602.

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

The square root of 220201001 is about 14839.1711695768. The cubic root of 220201001 is about 603.8648669591.

Adding to 220201001 its reverse (100102022), we get a palindrome (320303023).

The spelling of 220201001 in words is "two hundred twenty million, two hundred one thousand, one".