225308491 has 2 divisors, whose sum is σ = 225308492. Its totient is φ = 225308490.

The previous prime is 225308423. The next prime is 225308507. The reversal of 225308491 is 194803522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225308491 - 2¹¹ = 225306443 is a prime.

It is a super-2 number, since 2×225308491² = 101527832233394162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (225302491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112654245 + 112654246.

It is an arithmetic number, because the mean of its divisors is an integer number (112654246).

Almost surely, 2^225308491 is an apocalyptic number.

225308491 is a deficient number, since it is larger than the sum of its proper divisors (1).

225308491 is an equidigital number, since it uses as much as digits as its factorization.

225308491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 225308491 is about 15010.2795110551. The cubic root of 225308491 is about 608.4980436629.

The spelling of 225308491 in words is "two hundred twenty-five million, three hundred eight thousand, four hundred ninety-one".