225407891 has 2 divisors, whose sum is σ = 225407892. Its totient is φ = 225407890.

The previous prime is 225407869. The next prime is 225407909. The reversal of 225407891 is 198704522.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225407891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (225407491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112703945 + 112703946.

It is an arithmetic number, because the mean of its divisors is an integer number (112703946).

Almost surely, 2^225407891 is an apocalyptic number.

225407891 is a deficient number, since it is larger than the sum of its proper divisors (1).

225407891 is an equidigital number, since it uses as much as digits as its factorization.

225407891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 225407891 is about 15013.5902102062. The cubic root of 225407891 is about 608.5875147887.

The spelling of 225407891 in words is "two hundred twenty-five million, four hundred seven thousand, eight hundred ninety-one".