225638431 has 2 divisors, whose sum is σ = 225638432. Its totient is φ = 225638430.

The previous prime is 225638389. The next prime is 225638443. The reversal of 225638431 is 134836522.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225638431 is a prime.

It is a super-2 number, since 2×225638431² = 101825403088283522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225638731) 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, 112819215 + 112819216.

It is an arithmetic number, because the mean of its divisors is an integer number (112819216).

Almost surely, 2^225638431 is an apocalyptic number.

225638431 is a deficient number, since it is larger than the sum of its proper divisors (1).

225638431 is an equidigital number, since it uses as much as digits as its factorization.

225638431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 34.

The square root of 225638431 is about 15021.2659586334. The cubic root of 225638431 is about 608.7949253921.

The spelling of 225638431 in words is "two hundred twenty-five million, six hundred thirty-eight thousand, four hundred thirty-one".