213131563 has 4 divisors (see below), whose sum is σ = 216133488. Its totient is φ = 210129640.

The previous prime is 213131543. The next prime is 213131591. The reversal of 213131563 is 365131312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213131563 - 2²⁵ = 179577131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213131543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500856 + ... + 1500997.

It is an arithmetic number, because the mean of its divisors is an integer number (54033372).

Almost surely, 2^213131563 is an apocalyptic number.

213131563 is a deficient number, since it is larger than the sum of its proper divisors (3001925).

213131563 is an equidigital number, since it uses as much as digits as its factorization.

213131563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001924.

The product of its digits is 1620, while the sum is 25.

The square root of 213131563 is about 14599.0260976546. The cubic root of 213131563 is about 597.3321954269.

Adding to 213131563 its reverse (365131312), we get a palindrome (578262875).

The spelling of 213131563 in words is "two hundred thirteen million, one hundred thirty-one thousand, five hundred sixty-three".