1980220001 has 2 divisors, whose sum is σ = 1980220002. Its totient is φ = 1980220000.

The previous prime is 1980219991. The next prime is 1980220031. The reversal of 1980220001 is 1000220891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1524824401 + 455395600 = 39049^2 + 21340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980220001 - 2²² = 1976025697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1980220031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990110000 + 990110001.

It is an arithmetic number, because the mean of its divisors is an integer number (990110001).

Almost surely, 2^1980220001 is an apocalyptic number.

It is an amenable number.

1980220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980220001 is an equidigital number, since it uses as much as digits as its factorization.

1980220001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1980220001 is about 44499.6629313077. The cubic root of 1980220001 is about 1255.7537418083.

Adding to 1980220001 its reverse (1000220891), we get a palindrome (2980440892).

The spelling of 1980220001 in words is "one billion, nine hundred eighty million, two hundred twenty thousand, one".