1223498191 has 2 divisors, whose sum is σ = 1223498192. Its totient is φ = 1223498190.

The previous prime is 1223498147. The next prime is 1223498209. The reversal of 1223498191 is 1918943221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223498191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223498491) 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, 611749095 + 611749096.

It is an arithmetic number, because the mean of its divisors is an integer number (611749096).

Almost surely, 2^1223498191 is an apocalyptic number.

1223498191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223498191 is an equidigital number, since it uses as much as digits as its factorization.

1223498191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 1223498191 is about 34978.5390060820. The cubic root of 1223498191 is about 1069.5500454763.

The spelling of 1223498191 in words is "one billion, two hundred twenty-three million, four hundred ninety-eight thousand, one hundred ninety-one".