1223220001 has 4 divisors (see below), whose sum is σ = 1223397252. Its totient is φ = 1223042752.

The previous prime is 1223219999. The next prime is 1223220043. The reversal of 1223220001 is 1000223221.

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 27720225 + 1195499776 = 5265^2 + 34576^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223220001 - 2¹ = 1223219999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223220301) 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, 77836 + ... + 92221.

It is an arithmetic number, because the mean of its divisors is an integer number (305849313).

Almost surely, 2^1223220001 is an apocalyptic number.

It is an amenable number.

1223220001 is a deficient number, since it is larger than the sum of its proper divisors (177251).

1223220001 is an equidigital number, since it uses as much as digits as its factorization.

1223220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177250.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1223220001 is about 34974.5621988325. The cubic root of 1223220001 is about 1069.4689771966.

Adding to 1223220001 its reverse (1000223221), we get a palindrome (2223443222).

The spelling of 1223220001 in words is "one billion, two hundred twenty-three million, two hundred twenty thousand, one".