220997473 has 2 divisors, whose sum is σ = 220997474. Its totient is φ = 220997472.

The previous prime is 220997459. The next prime is 220997477. The reversal of 220997473 is 374799022.

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., 130233744 + 90763729 = 11412^2 + 9527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220997473 is a prime.

It is not a weakly prime, because it can be changed into another prime (220997477) 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, 110498736 + 110498737.

It is an arithmetic number, because the mean of its divisors is an integer number (110498737).

Almost surely, 2^220997473 is an apocalyptic number.

It is an amenable number.

220997473 is a deficient number, since it is larger than the sum of its proper divisors (1).

220997473 is an equidigital number, since it uses as much as digits as its factorization.

220997473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 220997473 is about 14865.9837548680. The cubic root of 220997473 is about 604.5920552034.

The spelling of 220997473 in words is "two hundred twenty million, nine hundred ninety-seven thousand, four hundred seventy-three".