1845561 has 4 divisors (see below), whose sum is σ = 2460752. Its totient is φ = 1230372.

The previous prime is 1845559. The next prime is 1845563. The reversal of 1845561 is 1655481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1845559) and next prime (1845563).

It is not a de Polignac number, because 1845561 - 2¹ = 1845559 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1845563) 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, 307591 + ... + 307596.

It is an arithmetic number, because the mean of its divisors is an integer number (615188).

2^1845561 is an apocalyptic number.

It is an amenable number.

1845561 is a deficient number, since it is larger than the sum of its proper divisors (615191).

1845561 is an equidigital number, since it uses as much as digits as its factorization.

1845561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615190.

The product of its digits is 4800, while the sum is 30.

The square root of 1845561 is about 1358.5142619789. The cubic root of 1845561 is about 122.6618380201.

The spelling of 1845561 in words is "one million, eight hundred forty-five thousand, five hundred sixty-one".