227813 has 4 divisors (see below), whose sum is σ = 228780. Its totient is φ = 226848.

The previous prime is 227797. The next prime is 227827. The reversal of 227813 is 318722.

Added to its reverse (318722) it gives a triangular number (546535 = T₁₀₄₅).

227813 = 337² + 338².

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 318722 = 2 ⋅159361.

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 113569 = 338^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 227813 - 2⁴ = 227797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (227873) 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, 131 + ... + 687.

It is an arithmetic number, because the mean of its divisors is an integer number (57195).

2²²⁷⁸¹³ is an apocalyptic number.

227813 is the 338-th centered square number.

It is an amenable number.

227813 is a deficient number, since it is larger than the sum of its proper divisors (967).

227813 is an equidigital number, since it uses as much as digits as its factorization.

227813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966.

The product of its digits is 672, while the sum is 23.

The square root of 227813 is about 477.2976010834. The cubic root of 227813 is about 61.0744410551.

Adding to 227813 its reverse (318722), we get a triangular number (546535 = T₁₀₄₅).

Subtracting 227813 from its reverse (318722), we obtain a palindrome (90909).

The spelling of 227813 in words is "two hundred twenty-seven thousand, eight hundred thirteen".