1145891 has 4 divisors (see below), whose sum is σ = 1150512. Its totient is φ = 1141272.

The previous prime is 1145873. The next prime is 1145897. The reversal of 1145891 is 1985411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1985411 = 67 ⋅29633.

It is a cyclic number.

It is not a de Polignac number, because 1145891 - 2¹⁰ = 1144867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145897) 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, 1916 + ... + 2441.

It is an arithmetic number, because the mean of its divisors is an integer number (287628).

2^1145891 is an apocalyptic number.

1145891 is a deficient number, since it is larger than the sum of its proper divisors (4621).

1145891 is an equidigital number, since it uses as much as digits as its factorization.

1145891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620.

The product of its digits is 1440, while the sum is 29.

The square root of 1145891 is about 1070.4629839467. The cubic root of 1145891 is about 104.6440250609.

The spelling of 1145891 in words is "one million, one hundred forty-five thousand, eight hundred ninety-one".