220799861 has 2 divisors, whose sum is σ = 220799862. Its totient is φ = 220799860.

The previous prime is 220799857. The next prime is 220799863. The reversal of 220799861 is 168997022.

It is a happy number.

220799861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181737361 + 39062500 = 13481^2 + 6250^2 .

It is a cyclic number.

It is not a de Polignac number, because 220799861 - 2² = 220799857 is a prime.

Together with 220799863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220799863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110399930 + 110399931.

It is an arithmetic number, because the mean of its divisors is an integer number (110399931).

Almost surely, 2^220799861 is an apocalyptic number.

It is an amenable number.

220799861 is a deficient number, since it is larger than the sum of its proper divisors (1).

220799861 is an equidigital number, since it uses as much as digits as its factorization.

220799861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 220799861 is about 14859.3358196119. The cubic root of 220799861 is about 604.4117963193.

The spelling of 220799861 in words is "two hundred twenty million, seven hundred ninety-nine thousand, eight hundred sixty-one".