1211597 has 2 divisors, whose sum is σ = 1211598. Its totient is φ = 1211596.

The previous prime is 1211593. The next prime is 1211599. The reversal of 1211597 is 7951121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 21316 = 1091^2 + 146^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211597 - 2² = 1211593 is a prime.

Together with 1211599, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 9, base 14 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211593) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605798 + 605799.

It is an arithmetic number, because the mean of its divisors is an integer number (605799).

2^1211597 is an apocalyptic number.

It is an amenable number.

1211597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211597 is an equidigital number, since it uses as much as digits as its factorization.

1211597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 26.

The square root of 1211597 is about 1100.7256697288. The cubic root of 1211597 is about 106.6070836942.

The spelling of 1211597 in words is "one million, two hundred eleven thousand, five hundred ninety-seven".