1591145 has 4 divisors (see below), whose sum is σ = 1909380. Its totient is φ = 1272912.

The previous prime is 1591141. The next prime is 1591159. The reversal of 1591145 is 5411951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5411951 = 29 ⋅186619.

It can be written as a sum of positive squares in 2 ways, for example, as 534361 + 1056784 = 731^2 + 1028^2 .

It is a cyclic number.

It is not a de Polignac number, because 1591145 - 2² = 1591141 is a prime.

It is a super-2 number, since 2×1591145² = 5063484822050, which contains 22 as substring.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159110 + ... + 159119.

It is an arithmetic number, because the mean of its divisors is an integer number (477345).

2^1591145 is an apocalyptic number.

It is an amenable number.

1591145 is a deficient number, since it is larger than the sum of its proper divisors (318235).

1591145 is an equidigital number, since it uses as much as digits as its factorization.

1591145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318234.

The product of its digits is 900, while the sum is 26.

The square root of 1591145 is about 1261.4059616158. The cubic root of 1591145 is about 116.7445421106.

The spelling of 1591145 in words is "one million, five hundred ninety-one thousand, one hundred forty-five".