223030991 has 2 divisors, whose sum is σ = 223030992. Its totient is φ = 223030990.

The previous prime is 223030979. The next prime is 223031057. The reversal of 223030991 is 199030322.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 223030991 - 2¹⁰ = 223029967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223030901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111515495 + 111515496.

It is an arithmetic number, because the mean of its divisors is an integer number (111515496).

Almost surely, 2^223030991 is an apocalyptic number.

223030991 is a deficient number, since it is larger than the sum of its proper divisors (1).

223030991 is an equidigital number, since it uses as much as digits as its factorization.

223030991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 223030991 is about 14934.2221424485. Note that the first 3 decimals coincide. The cubic root of 223030991 is about 606.4407898325.

The spelling of 223030991 in words is "two hundred twenty-three million, thirty thousand, nine hundred ninety-one".