12220657 has 2 divisors, whose sum is σ = 12220658. Its totient is φ = 12220656.

The previous prime is 12220651. The next prime is 12220661. The reversal of 12220657 is 75602221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7420176 + 4800481 = 2724^2 + 2191^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220657 - 2⁷ = 12220529 is a prime.

It is not a weakly prime, because it can be changed into another prime (12220651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110328 + 6110329.

It is an arithmetic number, because the mean of its divisors is an integer number (6110329).

Almost surely, 2^12220657 is an apocalyptic number.

It is an amenable number.

12220657 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220657 is an equidigital number, since it uses as much as digits as its factorization.

12220657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 12220657 is about 3495.8056296081. The cubic root of 12220657 is about 230.3376075370.

Adding to 12220657 its reverse (75602221), we get a palindrome (87822878).

The spelling of 12220657 in words is "twelve million, two hundred twenty thousand, six hundred fifty-seven".