225198091 has 2 divisors, whose sum is σ = 225198092. Its totient is φ = 225198090.

The previous prime is 225197941. The next prime is 225198097. The reversal of 225198091 is 190891522.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 225198091 - 2¹⁷ = 225067019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225198091.

It is not a weakly prime, because it can be changed into another prime (225198097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112599045 + 112599046.

It is an arithmetic number, because the mean of its divisors is an integer number (112599046).

Almost surely, 2^225198091 is an apocalyptic number.

225198091 is a deficient number, since it is larger than the sum of its proper divisors (1).

225198091 is an equidigital number, since it uses as much as digits as its factorization.

225198091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 225198091 is about 15006.6015806378. The cubic root of 225198091 is about 608.3986404565.

The spelling of 225198091 in words is "two hundred twenty-five million, one hundred ninety-eight thousand, ninety-one".