225221947 has 2 divisors, whose sum is σ = 225221948. Its totient is φ = 225221946.

The previous prime is 225221903. The next prime is 225221951. The reversal of 225221947 is 749122522.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225221947 - 2¹⁹ = 224697659 is a prime.

It is equal to p_12394357 and since 225221947 and 12394357 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (225221977) 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, 112610973 + 112610974.

It is an arithmetic number, because the mean of its divisors is an integer number (112610974).

Almost surely, 2^225221947 is an apocalyptic number.

225221947 is a deficient number, since it is larger than the sum of its proper divisors (1).

225221947 is an equidigital number, since it uses as much as digits as its factorization.

225221947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 225221947 is about 15007.3964097708. The cubic root of 225221947 is about 608.4201229439.

The spelling of 225221947 in words is "two hundred twenty-five million, two hundred twenty-one thousand, nine hundred forty-seven".