225138857 has 2 divisors, whose sum is σ = 225138858. Its totient is φ = 225138856.

The previous prime is 225138829. The next prime is 225138877. The reversal of 225138857 is 758831522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224130841 + 1008016 = 14971^2 + 1004^2 .

It is a cyclic number.

It is not a de Polignac number, because 225138857 - 2¹⁰ = 225137833 is a prime.

It is not a weakly prime, because it can be changed into another prime (225138877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112569428 + 112569429.

It is an arithmetic number, because the mean of its divisors is an integer number (112569429).

Almost surely, 2^225138857 is an apocalyptic number.

It is an amenable number.

225138857 is a deficient number, since it is larger than the sum of its proper divisors (1).

225138857 is an equidigital number, since it uses as much as digits as its factorization.

225138857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 41.

The square root of 225138857 is about 15004.6278527660. The cubic root of 225138857 is about 608.3452932825.

The spelling of 225138857 in words is "two hundred twenty-five million, one hundred thirty-eight thousand, eight hundred fifty-seven".