1591611 has 16 divisors (see below), whose sum is σ = 2553600. Its totient is φ = 861408.

The previous prime is 1591589. The next prime is 1591621. The reversal of 1591611 is 1161951.

It is not a de Polignac number, because 1591611 - 2⁶ = 1591547 is a prime.

1591611 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1591621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1596 + ... + 2393.

It is an arithmetic number, because the mean of its divisors is an integer number (159600).

2^1591611 is an apocalyptic number.

1591611 is a deficient number, since it is larger than the sum of its proper divisors (961989).

1591611 is a wasteful number, since it uses less digits than its factorization.

1591611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018.

The product of its digits is 270, while the sum is 24.

The square root of 1591611 is about 1261.5906626160. The cubic root of 1591611 is about 116.7559380229.

It can be divided in two parts, 159 and 1611, that added together give a triangular number (1770 = T₅₉).

The spelling of 1591611 in words is "one million, five hundred ninety-one thousand, six hundred eleven".