224190991 has 2 divisors, whose sum is σ = 224190992. Its totient is φ = 224190990.

The previous prime is 224190979. The next prime is 224190997. The reversal of 224190991 is 199091422.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 224190991 - 2⁹ = 224190479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 224190991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224190997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112095495 + 112095496.

It is an arithmetic number, because the mean of its divisors is an integer number (112095496).

Almost surely, 2^224190991 is an apocalyptic number.

224190991 is a deficient number, since it is larger than the sum of its proper divisors (1).

224190991 is an equidigital number, since it uses as much as digits as its factorization.

224190991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 224190991 is about 14973.0087490791. The cubic root of 224190991 is about 607.4903528305.

The spelling of 224190991 in words is "two hundred twenty-four million, one hundred ninety thousand, nine hundred ninety-one".