220717649 has 2 divisors, whose sum is σ = 220717650. Its totient is φ = 220717648.

The previous prime is 220717639. The next prime is 220717657. The reversal of 220717649 is 946717022.

220717649 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., 219780625 + 937024 = 14825^2 + 968^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220717649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_12159839 and since 220717649 and 12159839 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (220717639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110358824 + 110358825.

It is an arithmetic number, because the mean of its divisors is an integer number (110358825).

Almost surely, 2^220717649 is an apocalyptic number.

It is an amenable number.

220717649 is a deficient number, since it is larger than the sum of its proper divisors (1).

220717649 is an equidigital number, since it uses as much as digits as its factorization.

220717649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 220717649 is about 14856.5692203819. The cubic root of 220717649 is about 604.3367720103.

The spelling of 220717649 in words is "two hundred twenty million, seven hundred seventeen thousand, six hundred forty-nine".