1591065 has 24 divisors (see below), whose sum is σ = 3152448. Its totient is φ = 727200.

The previous prime is 1591033. The next prime is 1591097. The reversal of 1591065 is 5601951.

It is an interprime number because it is at equal distance from previous prime (1591033) and next prime (1591097).

It is not a de Polignac number, because 1591065 - 2⁵ = 1591033 is a prime.

It is a Curzon number.

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2211 + ... + 2840.

It is an arithmetic number, because the mean of its divisors is an integer number (131352).

2^1591065 is an apocalyptic number.

1591065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1591065 is a deficient number, since it is larger than the sum of its proper divisors (1561383).

1591065 is a wasteful number, since it uses less digits than its factorization.

1591065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5069 (or 5066 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 1591065 is about 1261.3742505696. The cubic root of 1591065 is about 116.7425855070.

The spelling of 1591065 in words is "one million, five hundred ninety-one thousand, sixty-five".