1591147 has 4 divisors (see below), whose sum is σ = 1594080. Its totient is φ = 1588216.

The previous prime is 1591141. The next prime is 1591159. The reversal of 1591147 is 7411951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7411951 = 37 ⋅200323.

It is a cyclic number.

It is not a de Polignac number, because 1591147 - 2¹⁹ = 1066859 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 388 + ... + 1825.

It is an arithmetic number, because the mean of its divisors is an integer number (398520).

2^1591147 is an apocalyptic number.

1591147 is a deficient number, since it is larger than the sum of its proper divisors (2933).

1591147 is an equidigital number, since it uses as much as digits as its factorization.

1591147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932.

The product of its digits is 1260, while the sum is 28.

The square root of 1591147 is about 1261.4067543818. The cubic root of 1591147 is about 116.7445910248.

The spelling of 1591147 in words is "one million, five hundred ninety-one thousand, one hundred forty-seven".