220645001 has 2 divisors, whose sum is σ = 220645002. Its totient is φ = 220645000.

The previous prime is 220644979. The next prime is 220645013. The reversal of 220645001 is 100546022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218892025 + 1752976 = 14795^2 + 1324^2 .

It is a cyclic number.

It is not a de Polignac number, because 220645001 - 2⁶ = 220644937 is a prime.

It is not a weakly prime, because it can be changed into another prime (220645501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110322500 + 110322501.

It is an arithmetic number, because the mean of its divisors is an integer number (110322501).

Almost surely, 2^220645001 is an apocalyptic number.

It is an amenable number.

220645001 is a deficient number, since it is larger than the sum of its proper divisors (1).

220645001 is an equidigital number, since it uses as much as digits as its factorization.

220645001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 220645001 is about 14854.1240401445. The cubic root of 220645001 is about 604.2704600263.

The spelling of 220645001 in words is "two hundred twenty million, six hundred forty-five thousand, one".