220432997 has 2 divisors, whose sum is σ = 220432998. Its totient is φ = 220432996.

The previous prime is 220432991. The next prime is 220433021. The reversal of 220432997 is 799234022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156975841 + 63457156 = 12529^2 + 7966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220432997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220432997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220432991) 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, 110216498 + 110216499.

It is an arithmetic number, because the mean of its divisors is an integer number (110216499).

Almost surely, 2^220432997 is an apocalyptic number.

It is an amenable number.

220432997 is a deficient number, since it is larger than the sum of its proper divisors (1).

220432997 is an equidigital number, since it uses as much as digits as its factorization.

220432997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 220432997 is about 14846.9861251366. The cubic root of 220432997 is about 604.0768627605.

The spelling of 220432997 in words is "two hundred twenty million, four hundred thirty-two thousand, nine hundred ninety-seven".