1217813 has 2 divisors, whose sum is σ = 1217814. Its totient is φ = 1217812.

The previous prime is 1217809. The next prime is 1217831. The reversal of 1217813 is 3187121.

It is a happy number.

Together with next prime (1217831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1170724 + 47089 = 1082^2 + 217^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217813 - 2² = 1217809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608906 + 608907.

It is an arithmetic number, because the mean of its divisors is an integer number (608907).

2^1217813 is an apocalyptic number.

It is an amenable number.

1217813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217813 is an equidigital number, since it uses as much as digits as its factorization.

1217813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 23.

The square root of 1217813 is about 1103.5456492597. The cubic root of 1217813 is about 106.7890857938.

The spelling of 1217813 in words is "one million, two hundred seventeen thousand, eight hundred thirteen".