1591161 has 16 divisors (see below), whose sum is σ = 2493120. Its totient is φ = 889920.

The previous prime is 1591159. The next prime is 1591189. The reversal of 1591161 is 1611951.

It is not a de Polignac number, because 1591161 - 2¹ = 1591159 is a prime.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1591141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1426 + ... + 2283.

It is an arithmetic number, because the mean of its divisors is an integer number (155820).

2^1591161 is an apocalyptic number.

1591161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1591161 is a deficient number, since it is larger than the sum of its proper divisors (901959).

1591161 is a wasteful number, since it uses less digits than its factorization.

1591161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3736.

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

The square root of 1591161 is about 1261.4123037294. The cubic root of 1591161 is about 116.7449334234.

The spelling of 1591161 in words is "one million, five hundred ninety-one thousand, one hundred sixty-one".