225686291 has 2 divisors, whose sum is σ = 225686292. Its totient is φ = 225686290.

The previous prime is 225686221. The next prime is 225686297. The reversal of 225686291 is 192686522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225686291 - 2¹⁴ = 225669907 is a prime.

It is not a weakly prime, because it can be changed into another prime (225686297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112843145 + 112843146.

It is an arithmetic number, because the mean of its divisors is an integer number (112843146).

Almost surely, 2^225686291 is an apocalyptic number.

225686291 is a deficient number, since it is larger than the sum of its proper divisors (1).

225686291 is an equidigital number, since it uses as much as digits as its factorization.

225686291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 225686291 is about 15022.8589489484. The cubic root of 225686291 is about 608.8379660290.

The spelling of 225686291 in words is "two hundred twenty-five million, six hundred eighty-six thousand, two hundred ninety-one".