220464781 has 2 divisors, whose sum is σ = 220464782. Its totient is φ = 220464780.

The previous prime is 220464779. The next prime is 220464841. The reversal of 220464781 is 187464022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161036100 + 59428681 = 12690^2 + 7709^2 .

It is a cyclic number.

It is not a de Polignac number, because 220464781 - 2¹ = 220464779 is a prime.

It is a super-2 number, since 2×220464781² = 97209439322755922, which contains 22 as substring.

Together with 220464779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220464701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110232390 + 110232391.

It is an arithmetic number, because the mean of its divisors is an integer number (110232391).

Almost surely, 2^220464781 is an apocalyptic number.

It is an amenable number.

220464781 is a deficient number, since it is larger than the sum of its proper divisors (1).

220464781 is an equidigital number, since it uses as much as digits as its factorization.

220464781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 220464781 is about 14848.0564721448. The cubic root of 220464781 is about 604.1058950991.

The spelling of 220464781 in words is "two hundred twenty million, four hundred sixty-four thousand, seven hundred eighty-one".