1813523 has 2 divisors, whose sum is σ = 1813524. Its totient is φ = 1813522.

The previous prime is 1813517. The next prime is 1813547. The reversal of 1813523 is 3253181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1813523 - 2⁶ = 1813459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1813583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906761 + 906762.

It is an arithmetic number, because the mean of its divisors is an integer number (906762).

2^1813523 is an apocalyptic number.

1813523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813523 is an equidigital number, since it uses as much as digits as its factorization.

1813523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 1813523 is about 1346.6710808509. The cubic root of 1813523 is about 121.9479084249.

The spelling of 1813523 in words is "one million, eight hundred thirteen thousand, five hundred twenty-three".