220064981 has 2 divisors, whose sum is σ = 220064982. Its totient is φ = 220064980.

The previous prime is 220064953. The next prime is 220065029. The reversal of 220064981 is 189460022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199769956 + 20295025 = 14134^2 + 4505^2 .

It is a cyclic number.

It is not a de Polignac number, because 220064981 - 2¹⁰ = 220063957 is a prime.

It is a super-2 number, since 2×220064981² = 96857191725060722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220064921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110032490 + 110032491.

It is an arithmetic number, because the mean of its divisors is an integer number (110032491).

Almost surely, 2^220064981 is an apocalyptic number.

It is an amenable number.

220064981 is a deficient number, since it is larger than the sum of its proper divisors (1).

220064981 is an equidigital number, since it uses as much as digits as its factorization.

220064981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 220064981 is about 14834.5873215267. The cubic root of 220064981 is about 603.7405038893.

The spelling of 220064981 in words is "two hundred twenty million, sixty-four thousand, nine hundred eighty-one".