225391891 has 2 divisors, whose sum is σ = 225391892. Its totient is φ = 225391890.

The previous prime is 225391867. The next prime is 225391921. The reversal of 225391891 is 198193522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 225391891 - 2¹³ = 225383699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (225391841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112695945 + 112695946.

It is an arithmetic number, because the mean of its divisors is an integer number (112695946).

Almost surely, 2^225391891 is an apocalyptic number.

225391891 is a deficient number, since it is larger than the sum of its proper divisors (1).

225391891 is an equidigital number, since it uses as much as digits as its factorization.

225391891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 225391891 is about 15013.0573501869. The cubic root of 225391891 is about 608.5731147742.

The spelling of 225391891 in words is "two hundred twenty-five million, three hundred ninety-one thousand, eight hundred ninety-one".