220688081 has 2 divisors, whose sum is σ = 220688082. Its totient is φ = 220688080.

The previous prime is 220688029. The next prime is 220688099. The reversal of 220688081 is 180886022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158357056 + 62331025 = 12584^2 + 7895^2 .

It is a cyclic number.

It is not a de Polignac number, because 220688081 - 2¹⁰ = 220687057 is a prime.

It is a super-2 number, since 2×220688081² = 97406458190925122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (220688011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110344040 + 110344041.

It is an arithmetic number, because the mean of its divisors is an integer number (110344041).

Almost surely, 2^220688081 is an apocalyptic number.

It is an amenable number.

220688081 is a deficient number, since it is larger than the sum of its proper divisors (1).

220688081 is an equidigital number, since it uses as much as digits as its factorization.

220688081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 220688081 is about 14855.5740717079. The cubic root of 220688081 is about 604.3097845480.

The spelling of 220688081 in words is "two hundred twenty million, six hundred eighty-eight thousand, eighty-one".