225749939 has 2 divisors, whose sum is σ = 225749940. Its totient is φ = 225749938.

The previous prime is 225749929. The next prime is 225749969. The reversal of 225749939 is 939947522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 225749939 - 2²⁴ = 208972723 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (225749929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112874969 + 112874970.

It is an arithmetic number, because the mean of its divisors is an integer number (112874970).

Almost surely, 2^225749939 is an apocalyptic number.

225749939 is a deficient number, since it is larger than the sum of its proper divisors (1).

225749939 is an equidigital number, since it uses as much as digits as its factorization.

225749939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 50.

The square root of 225749939 is about 15024.9771713637. The cubic root of 225749939 is about 608.8951954341.

The spelling of 225749939 in words is "two hundred twenty-five million, seven hundred forty-nine thousand, nine hundred thirty-nine".