220868629 has 2 divisors, whose sum is σ = 220868630. Its totient is φ = 220868628.

The previous prime is 220868591. The next prime is 220868663. The reversal of 220868629 is 926868022.

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., 156500100 + 64368529 = 12510^2 + 8023^2 .

It is a cyclic number.

It is not a de Polignac number, because 220868629 - 2¹⁵ = 220835861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220868929) 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, 110434314 + 110434315.

It is an arithmetic number, because the mean of its divisors is an integer number (110434315).

Almost surely, 2^220868629 is an apocalyptic number.

It is an amenable number.

220868629 is a deficient number, since it is larger than the sum of its proper divisors (1).

220868629 is an equidigital number, since it uses as much as digits as its factorization.

220868629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 220868629 is about 14861.6496056124. The cubic root of 220868629 is about 604.4745377177.

The spelling of 220868629 in words is "two hundred twenty million, eight hundred sixty-eight thousand, six hundred twenty-nine".