1591167 has 4 divisors (see below), whose sum is σ = 2121560. Its totient is φ = 1060776.

The previous prime is 1591159. The next prime is 1591189. The reversal of 1591167 is 7611951.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1591167 - 2³ = 1591159 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265192 + ... + 265197.

It is an arithmetic number, because the mean of its divisors is an integer number (530390).

2^1591167 is an apocalyptic number.

1591167 is a deficient number, since it is larger than the sum of its proper divisors (530393).

1591167 is an equidigital number, since it uses as much as digits as its factorization.

1591167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530392.

The product of its digits is 1890, while the sum is 30.

The square root of 1591167 is about 1261.4146820138. The cubic root of 1591167 is about 116.7450801651.

It can be divided in two parts, 159 and 1167, that added together give a triangular number (1326 = T₅₁).

The spelling of 1591167 in words is "one million, five hundred ninety-one thousand, one hundred sixty-seven".