1045591 has 4 divisors (see below), whose sum is σ = 1053952. Its totient is φ = 1037232.

The previous prime is 1045573. The next prime is 1045607. The reversal of 1045591 is 1955401.

1045591 = 20² + 21² + ... + 146².

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

It is a 4-Lehmer number, since φ(1045591) divides (1045591-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 1045591 - 2⁵ = 1045559 is a prime.

It is a Duffinian number.

1045591 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045571) 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, 3990 + ... + 4243.

It is an arithmetic number, because the mean of its divisors is an integer number (263488).

2^1045591 is an apocalyptic number.

1045591 is a deficient number, since it is larger than the sum of its proper divisors (8361).

1045591 is an equidigital number, since it uses as much as digits as its factorization.

1045591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8360.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1045591 is about 1022.5414417030. The cubic root of 1045591 is about 101.4971728689.

The spelling of 1045591 in words is "one million, forty-five thousand, five hundred ninety-one".