1217261 has 2 divisors, whose sum is σ = 1217262. Its totient is φ = 1217260.

The previous prime is 1217233. The next prime is 1217269. The reversal of 1217261 is 1627121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1144900 + 72361 = 1070^2 + 269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217269) 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, 608630 + 608631.

It is an arithmetic number, because the mean of its divisors is an integer number (608631).

2^1217261 is an apocalyptic number.

It is an amenable number.

1217261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217261 is an equidigital number, since it uses as much as digits as its factorization.

1217261 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 1217261 is about 1103.2955179824. The cubic root of 1217261 is about 106.7729485369.

The spelling of 1217261 in words is "one million, two hundred seventeen thousand, two hundred sixty-one".