1591097 has 2 divisors, whose sum is σ = 1591098. Its totient is φ = 1591096.

The previous prime is 1591033. The next prime is 1591099. The reversal of 1591097 is 7901951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1510441 + 80656 = 1229^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 1591097 - 2⁶ = 1591033 is a prime.

Together with 1591099, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1591099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795548 + 795549.

It is an arithmetic number, because the mean of its divisors is an integer number (795549).

2^1591097 is an apocalyptic number.

It is an amenable number.

1591097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591097 is an equidigital number, since it uses as much as digits as its factorization.

1591097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835, while the sum is 32.

The square root of 1591097 is about 1261.3869350838. The cubic root of 1591097 is about 116.7433681563.

The spelling of 1591097 in words is "one million, five hundred ninety-one thousand, ninety-seven".