220239997 has 2 divisors, whose sum is σ = 220239998. Its totient is φ = 220239996.

The previous prime is 220239991. The next prime is 220240037. The reversal of 220239997 is 799932022.

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., 160934596 + 59305401 = 12686^2 + 7701^2 .

It is a cyclic number.

It is not a de Polignac number, because 220239997 - 2²³ = 211851389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220239991) 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, 110119998 + 110119999.

It is an arithmetic number, because the mean of its divisors is an integer number (110119999).

Almost surely, 2^220239997 is an apocalyptic number.

It is an amenable number.

220239997 is a deficient number, since it is larger than the sum of its proper divisors (1).

220239997 is an equidigital number, since it uses as much as digits as its factorization.

220239997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 220239997 is about 14840.4850661965. The cubic root of 220239997 is about 603.9005115509.

The spelling of 220239997 in words is "two hundred twenty million, two hundred thirty-nine thousand, nine hundred ninety-seven".