1331597 has 2 divisors, whose sum is σ = 1331598. Its totient is φ = 1331596.

The previous prime is 1331591. The next prime is 1331599. The reversal of 1331597 is 7951331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 90601 = 1114^2 + 301^2 .

It is an emirp because it is prime and its reverse (7951331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331597 - 2¹⁴ = 1315213 is a prime.

Together with 1331599, 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 (1331591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665798 + 665799.

It is an arithmetic number, because the mean of its divisors is an integer number (665799).

2^1331597 is an apocalyptic number.

It is an amenable number.

1331597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331597 is an equidigital number, since it uses as much as digits as its factorization.

1331597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835, while the sum is 29.

The square root of 1331597 is about 1153.9484390561. The cubic root of 1331597 is about 110.0164438227.

The spelling of 1331597 in words is "one million, three hundred thirty-one thousand, five hundred ninety-seven".