220776497 has 2 divisors, whose sum is σ = 220776498. Its totient is φ = 220776496.

The previous prime is 220776469. The next prime is 220776499. The reversal of 220776497 is 794677022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191573281 + 29203216 = 13841^2 + 5404^2 .

It is a cyclic number.

It is not a de Polignac number, because 220776497 - 2¹⁰ = 220775473 is a prime.

It is a super-3 number, since 3×220776497³ (a number of 26 digits) contains 333 as substring.

Together with 220776499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220776499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110388248 + 110388249.

It is an arithmetic number, because the mean of its divisors is an integer number (110388249).

Almost surely, 2^220776497 is an apocalyptic number.

It is an amenable number.

220776497 is a deficient number, since it is larger than the sum of its proper divisors (1).

220776497 is an equidigital number, since it uses as much as digits as its factorization.

220776497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 220776497 is about 14858.5496263936. The cubic root of 220776497 is about 604.3904768987.

The spelling of 220776497 in words is "two hundred twenty million, seven hundred seventy-six thousand, four hundred ninety-seven".