213431503 has 24 divisors (see below), whose sum is σ = 239629520. Its totient is φ = 189949536.

The previous prime is 213431479. The next prime is 213431521. The reversal of 213431503 is 305134312.

It is not a de Polignac number, because 213431503 - 2⁹ = 213430991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213431563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5768401 + ... + 5768437.

Almost surely, 2^213431503 is an apocalyptic number.

213431503 is a deficient number, since it is larger than the sum of its proper divisors (26198017).

213431503 is an frugal number, since it uses more digits than its factorization.

213431503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 213431503 is about 14609.2950890863. The cubic root of 213431503 is about 597.6122725712.

Adding to 213431503 its reverse (305134312), we get a palindrome (518565815).

The spelling of 213431503 in words is "two hundred thirteen million, four hundred thirty-one thousand, five hundred three".