1845521 has 2 divisors, whose sum is σ = 1845522. Its totient is φ = 1845520.

The previous prime is 1845509. The next prime is 1845539. The reversal of 1845521 is 1255481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1290496 + 555025 = 1136^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1845521 - 2⁶ = 1845457 is a prime.

It is a super-2 number, since 2×1845521² = 6811895522882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1845541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 922760 + 922761.

It is an arithmetic number, because the mean of its divisors is an integer number (922761).

2^1845521 is an apocalyptic number.

It is an amenable number.

1845521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1845521 is an equidigital number, since it uses as much as digits as its factorization.

1845521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1600, while the sum is 26.

The square root of 1845521 is about 1358.4995399337. The cubic root of 1845521 is about 122.6609518381.

The spelling of 1845521 in words is "one million, eight hundred forty-five thousand, five hundred twenty-one".