220940581 has 2 divisors, whose sum is σ = 220940582. Its totient is φ = 220940580.

The previous prime is 220940567. The next prime is 220940593. The reversal of 220940581 is 185049022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220047556 + 893025 = 14834^2 + 945^2 .

It is a cyclic number.

It is not a de Polignac number, because 220940581 - 2¹³ = 220932389 is a prime.

It is a super-2 number, since 2×220940581² = 97629480665235122, 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 (220940501) 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, 110470290 + 110470291.

It is an arithmetic number, because the mean of its divisors is an integer number (110470291).

Almost surely, 2^220940581 is an apocalyptic number.

It is an amenable number.

220940581 is a deficient number, since it is larger than the sum of its proper divisors (1).

220940581 is an equidigital number, since it uses as much as digits as its factorization.

220940581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 220940581 is about 14864.0701357333. The cubic root of 220940581 is about 604.5401701407.

The spelling of 220940581 in words is "two hundred twenty million, nine hundred forty thousand, five hundred eighty-one".