1591189 has 2 divisors, whose sum is σ = 1591190. Its totient is φ = 1591188.

The previous prime is 1591159. The next prime is 1591207. The reversal of 1591189 is 9811951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935089 + 656100 = 967^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1591189 - 2¹⁷ = 1460117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1591159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795594 + 795595.

It is an arithmetic number, because the mean of its divisors is an integer number (795595).

2^1591189 is an apocalyptic number.

It is an amenable number.

1591189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591189 is an equidigital number, since it uses as much as digits as its factorization.

1591189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 34.

The square root of 1591189 is about 1261.4234023515. The cubic root of 1591189 is about 116.7456182146.

It can be divided in two parts, 15 and 91189, that added together give a square (91204 = 302²).

The spelling of 1591189 in words is "one million, five hundred ninety-one thousand, one hundred eighty-nine".