225721202389 has 2 divisors, whose sum is σ = 225721202390. Its totient is φ = 225721202388.

The previous prime is 225721202359. The next prime is 225721202417. The reversal of 225721202389 is 983202127522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224896938289 + 824264100 = 474233^2 + 28710^2 .

It is a cyclic number.

It is not a de Polignac number, because 225721202389 - 2¹⁹ = 225720678101 is a prime.

It is a super-2 number, since 2×225721202389² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225721202359) 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, 112860601194 + 112860601195.

It is an arithmetic number, because the mean of its divisors is an integer number (112860601195).

Almost surely, 2^225721202389 is an apocalyptic number.

It is an amenable number.

225721202389 is a deficient number, since it is larger than the sum of its proper divisors (1).

225721202389 is an equidigital number, since it uses as much as digits as its factorization.

225721202389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 225721202389 in words is "two hundred twenty-five billion, seven hundred twenty-one million, two hundred two thousand, three hundred eighty-nine".