2113523 has 2 divisors, whose sum is σ = 2113524. Its totient is φ = 2113522.

The previous prime is 2113513. The next prime is 2113567. The reversal of 2113523 is 3253112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2113523 - 2⁶ = 2113459 is a prime.

It is not a weakly prime, because it can be changed into another prime (2113513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056761 + 1056762.

It is an arithmetic number, because the mean of its divisors is an integer number (1056762).

2^2113523 is an apocalyptic number.

2113523 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113523 is an equidigital number, since it uses as much as digits as its factorization.

2113523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 17.

The square root of 2113523 is about 1453.7960654782. The cubic root of 2113523 is about 128.3322059083.

Adding to 2113523 its reverse (3253112), we get a palindrome (5366635).

The spelling of 2113523 in words is "two million, one hundred thirteen thousand, five hundred twenty-three".