225205391 has 2 divisors, whose sum is σ = 225205392. Its totient is φ = 225205390.

The previous prime is 225205349. The next prime is 225205399. The reversal of 225205391 is 193502522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225205391 - 2⁶ = 225205327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225205399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112602695 + 112602696.

It is an arithmetic number, because the mean of its divisors is an integer number (112602696).

Almost surely, 2^225205391 is an apocalyptic number.

225205391 is a deficient number, since it is larger than the sum of its proper divisors (1).

225205391 is an equidigital number, since it uses as much as digits as its factorization.

225205391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 225205391 is about 15006.8448049548. The cubic root of 225205391 is about 608.4052143164.

The spelling of 225205391 in words is "two hundred twenty-five million, two hundred five thousand, three hundred ninety-one".