221453191 has 2 divisors, whose sum is σ = 221453192. Its totient is φ = 221453190.

The previous prime is 221453173. The next prime is 221453317. The reversal of 221453191 is 191354122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221453191 - 2¹¹ = 221451143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221453161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110726595 + 110726596.

It is an arithmetic number, because the mean of its divisors is an integer number (110726596).

Almost surely, 2^221453191 is an apocalyptic number.

221453191 is a deficient number, since it is larger than the sum of its proper divisors (1).

221453191 is an equidigital number, since it uses as much as digits as its factorization.

221453191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 221453191 is about 14881.3034039361. The cubic root of 221453191 is about 605.0073454929.

The spelling of 221453191 in words is "two hundred twenty-one million, four hundred fifty-three thousand, one hundred ninety-one".