220618973 has 2 divisors, whose sum is σ = 220618974. Its totient is φ = 220618972.

The previous prime is 220618963. The next prime is 220619039. The reversal of 220618973 is 379816022.

220618973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201583204 + 19035769 = 14198^2 + 4363^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220618973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220618963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110309486 + 110309487.

It is an arithmetic number, because the mean of its divisors is an integer number (110309487).

Almost surely, 2^220618973 is an apocalyptic number.

It is an amenable number.

220618973 is a deficient number, since it is larger than the sum of its proper divisors (1).

220618973 is an equidigital number, since it uses as much as digits as its factorization.

220618973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 220618973 is about 14853.2478939793. The cubic root of 220618973 is about 604.2466985242.

The spelling of 220618973 in words is "two hundred twenty million, six hundred eighteen thousand, nine hundred seventy-three".