220634989 has 2 divisors, whose sum is σ = 220634990. Its totient is φ = 220634988.

The previous prime is 220634957. The next prime is 220635053. The reversal of 220634989 is 989436022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201782025 + 18852964 = 14205^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 220634989 - 2⁵ = 220634957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220634189) 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, 110317494 + 110317495.

It is an arithmetic number, because the mean of its divisors is an integer number (110317495).

Almost surely, 2^220634989 is an apocalyptic number.

It is an amenable number.

220634989 is a deficient number, since it is larger than the sum of its proper divisors (1).

220634989 is an equidigital number, since it uses as much as digits as its factorization.

220634989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 220634989 is about 14853.7870255366. The cubic root of 220634989 is about 604.2613200846.

It can be divided in two parts, 220 and 634989, that added together give a square (635209 = 797²).

The spelling of 220634989 in words is "two hundred twenty million, six hundred thirty-four thousand, nine hundred eighty-nine".