225188813 has 2 divisors, whose sum is σ = 225188814. Its totient is φ = 225188812.

The previous prime is 225188693. The next prime is 225188827. The reversal of 225188813 is 318881522.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118417924 + 106770889 = 10882^2 + 10333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225188813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225188833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112594406 + 112594407.

It is an arithmetic number, because the mean of its divisors is an integer number (112594407).

Almost surely, 2^225188813 is an apocalyptic number.

It is an amenable number.

225188813 is a deficient number, since it is larger than the sum of its proper divisors (1).

225188813 is an equidigital number, since it uses as much as digits as its factorization.

225188813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 38.

The square root of 225188813 is about 15006.2924468371. The cubic root of 225188813 is about 608.3902851457.

The spelling of 225188813 in words is "two hundred twenty-five million, one hundred eighty-eight thousand, eight hundred thirteen".