213442523 has 16 divisors (see below), whose sum is σ = 265632000. Its totient is φ = 167342112.

The previous prime is 213442519. The next prime is 213442547. The reversal of 213442523 is 325244312.

It is not a de Polignac number, because 213442523 - 2² = 213442519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213442492 and 213442501.

It is not an unprimeable number, because it can be changed into a prime (213442573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23813 + ... + 31526.

It is an arithmetic number, because the mean of its divisors is an integer number (16602000).

Almost surely, 2^213442523 is an apocalyptic number.

213442523 is a deficient number, since it is larger than the sum of its proper divisors (52189477).

213442523 is a wasteful number, since it uses less digits than its factorization.

213442523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55394.

The product of its digits is 5760, while the sum is 26.

The square root of 213442523 is about 14609.6722413612. The cubic root of 213442523 is about 597.6225577975.

Adding to 213442523 its reverse (325244312), we get a palindrome (538686835).

The spelling of 213442523 in words is "two hundred thirteen million, four hundred forty-two thousand, five hundred twenty-three".