220779197 has 2 divisors, whose sum is σ = 220779198. Its totient is φ = 220779196.

The previous prime is 220779193. The next prime is 220779227. The reversal of 220779197 is 791977022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166771396 + 54007801 = 12914^2 + 7349^2 .

It is a cyclic number.

It is not a de Polignac number, because 220779197 - 2² = 220779193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220779193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110389598 + 110389599.

It is an arithmetic number, because the mean of its divisors is an integer number (110389599).

Almost surely, 2^220779197 is an apocalyptic number.

It is an amenable number.

220779197 is a deficient number, since it is larger than the sum of its proper divisors (1).

220779197 is an equidigital number, since it uses as much as digits as its factorization.

220779197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 220779197 is about 14858.6404828975. The cubic root of 220779197 is about 604.3929406990.

The spelling of 220779197 in words is "two hundred twenty million, seven hundred seventy-nine thousand, one hundred ninety-seven".