1217575397 has 2 divisors, whose sum is σ = 1217575398. Its totient is φ = 1217575396.

The previous prime is 1217575393. The next prime is 1217575399. The reversal of 1217575397 is 7935757121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1150973476 + 66601921 = 33926^2 + 8161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217575397 - 2² = 1217575393 is a prime.

Together with 1217575399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217575393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608787698 + 608787699.

It is an arithmetic number, because the mean of its divisors is an integer number (608787699).

Almost surely, 2^1217575397 is an apocalyptic number.

It is an amenable number.

1217575397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217575397 is an equidigital number, since it uses as much as digits as its factorization.

1217575397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 463050, while the sum is 47.

The square root of 1217575397 is about 34893.7730404724. The cubic root of 1217575397 is about 1067.8214026731.

The spelling of 1217575397 in words is "one billion, two hundred seventeen million, five hundred seventy-five thousand, three hundred ninety-seven".