225439639 has 2 divisors, whose sum is σ = 225439640. Its totient is φ = 225439638.

The previous prime is 225439619. The next prime is 225439651. The reversal of 225439639 is 936934522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225439639 - 2¹⁵ = 225406871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 225439595 and 225439604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225439619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112719819 + 112719820.

It is an arithmetic number, because the mean of its divisors is an integer number (112719820).

Almost surely, 2^225439639 is an apocalyptic number.

225439639 is a deficient number, since it is larger than the sum of its proper divisors (1).

225439639 is an equidigital number, since it uses as much as digits as its factorization.

225439639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 43.

The square root of 225439639 is about 15014.6474817093. The cubic root of 225439639 is about 608.6160859998.

The spelling of 225439639 in words is "two hundred twenty-five million, four hundred thirty-nine thousand, six hundred thirty-nine".