220641797 has 2 divisors, whose sum is σ = 220641798. Its totient is φ = 220641796.

The previous prime is 220641781. The next prime is 220641877. The reversal of 220641797 is 797146022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220492801 + 148996 = 14849^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 220641797 - 2⁴ = 220641781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220641797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220641097) 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, 110320898 + 110320899.

It is an arithmetic number, because the mean of its divisors is an integer number (110320899).

Almost surely, 2^220641797 is an apocalyptic number.

It is an amenable number.

220641797 is a deficient number, since it is larger than the sum of its proper divisors (1).

220641797 is an equidigital number, since it uses as much as digits as its factorization.

220641797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 220641797 is about 14854.0161909162. The cubic root of 220641797 is about 604.2675351290.

The spelling of 220641797 in words is "two hundred twenty million, six hundred forty-one thousand, seven hundred ninety-seven".