225981823 has 2 divisors, whose sum is σ = 225981824. Its totient is φ = 225981822.

The previous prime is 225981761. The next prime is 225981827. The reversal of 225981823 is 328189522.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225981823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225981827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112990911 + 112990912.

It is an arithmetic number, because the mean of its divisors is an integer number (112990912).

Almost surely, 2^225981823 is an apocalyptic number.

225981823 is a deficient number, since it is larger than the sum of its proper divisors (1).

225981823 is an equidigital number, since it uses as much as digits as its factorization.

225981823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 40.

The square root of 225981823 is about 15032.6918081892. The cubic root of 225981823 is about 609.1036041104.

The spelling of 225981823 in words is "two hundred twenty-five million, nine hundred eighty-one thousand, eight hundred twenty-three".