1220257 has 2 divisors, whose sum is σ = 1220258. Its totient is φ = 1220256.

The previous prime is 1220251. The next prime is 1220309. The reversal of 1220257 is 7520221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1089936 + 130321 = 1044^2 + 361^2 .

It is an emirp because it is prime and its reverse (7520221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220257 - 2³ = 1220249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610128 + 610129.

It is an arithmetic number, because the mean of its divisors is an integer number (610129).

2^1220257 is an apocalyptic number.

It is an amenable number.

1220257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220257 is an equidigital number, since it uses as much as digits as its factorization.

1220257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 1220257 is about 1104.6524340262. The cubic root of 1220257 is about 106.8604755520.

Adding to 1220257 its reverse (7520221), we get a palindrome (8740478).

The spelling of 1220257 in words is "one million, two hundred twenty thousand, two hundred fifty-seven".