1001220001 has 2 divisors, whose sum is σ = 1001220002. Its totient is φ = 1001220000.

The previous prime is 1001219987. The next prime is 1001220013. The reversal of 1001220001 is 1000221001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 594189376 + 407030625 = 24376^2 + 20175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001220001 - 2⁹ = 1001219489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001220601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500610000 + 500610001.

It is an arithmetic number, because the mean of its divisors is an integer number (500610001).

Almost surely, 2^1001220001 is an apocalyptic number.

It is an amenable number.

1001220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001220001 is an equidigital number, since it uses as much as digits as its factorization.

1001220001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1001220001 is about 31642.0606313811. The cubic root of 1001220001 is about 1000.4065017339.

Adding to 1001220001 its reverse (1000221001), we get a palindrome (2001441002).

The spelling of 1001220001 in words is "one billion, one million, two hundred twenty thousand, one".