1391597 has 2 divisors, whose sum is σ = 1391598. Its totient is φ = 1391596.

The previous prime is 1391587. The next prime is 1391627. The reversal of 1391597 is 7951931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1359556 + 32041 = 1166^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391597 - 2¹⁰ = 1390573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695798 + 695799.

It is an arithmetic number, because the mean of its divisors is an integer number (695799).

2^1391597 is an apocalyptic number.

It is an amenable number.

1391597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391597 is an equidigital number, since it uses as much as digits as its factorization.

1391597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8505, while the sum is 35.

The square root of 1391597 is about 1179.6596966922. The cubic root of 1391597 is about 111.6446272189.

The spelling of 1391597 in words is "one million, three hundred ninety-one thousand, five hundred ninety-seven".