1591697 has 2 divisors, whose sum is σ = 1591698. Its totient is φ = 1591696.

The previous prime is 1591663. The next prime is 1591721. The reversal of 1591697 is 7961951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1577536 + 14161 = 1256^2 + 119^2 .

It is an emirp because it is prime and its reverse (7961951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1591697 - 2⁸ = 1591441 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1591697.

It is not a weakly prime, because it can be changed into another prime (1591637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795848 + 795849.

It is an arithmetic number, because the mean of its divisors is an integer number (795849).

2^1591697 is an apocalyptic number.

It is an amenable number.

1591697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591697 is an equidigital number, since it uses as much as digits as its factorization.

1591697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010, while the sum is 38.

The square root of 1591697 is about 1261.6247461111. The cubic root of 1591697 is about 116.7580408880.

The spelling of 1591697 in words is "one million, five hundred ninety-one thousand, six hundred ninety-seven".