1212917 has 2 divisors, whose sum is σ = 1212918. Its totient is φ = 1212916.

The previous prime is 1212907. The next prime is 1212919. The reversal of 1212917 is 7192121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 758641 + 454276 = 871^2 + 674^2 .

It is an emirp because it is prime and its reverse (7192121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212917 - 2⁶ = 1212853 is a prime.

Together with 1212919, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212892 and 1212901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606458 + 606459.

It is an arithmetic number, because the mean of its divisors is an integer number (606459).

2^1212917 is an apocalyptic number.

It is an amenable number.

1212917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212917 is an equidigital number, since it uses as much as digits as its factorization.

1212917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 23.

The square root of 1212917 is about 1101.3251109459. The cubic root of 1212917 is about 106.6457847577.

The spelling of 1212917 in words is "one million, two hundred twelve thousand, nine hundred seventeen".