1261217 has 2 divisors, whose sum is σ = 1261218. Its totient is φ = 1261216.

The previous prime is 1261199. The next prime is 1261223. The reversal of 1261217 is 7121621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 26896 = 1111^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261217 - 2¹⁴ = 1244833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261717) 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, 630608 + 630609.

It is an arithmetic number, because the mean of its divisors is an integer number (630609).

2^1261217 is an apocalyptic number.

It is an amenable number.

1261217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261217 is an equidigital number, since it uses as much as digits as its factorization.

1261217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 20.

The square root of 1261217 is about 1123.0391800823. The cubic root of 1261217 is about 108.0429927140.

Adding to 1261217 its reverse (7121621), we get a palindrome (8382838).

The spelling of 1261217 in words is "one million, two hundred sixty-one thousand, two hundred seventeen".