1223455591 has 2 divisors, whose sum is σ = 1223455592. Its totient is φ = 1223455590.

The previous prime is 1223455559. The next prime is 1223455601. The reversal of 1223455591 is 1955543221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1223455591 - 2⁵ = 1223455559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1223455591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223455511) 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, 611727795 + 611727796.

It is an arithmetic number, because the mean of its divisors is an integer number (611727796).

Almost surely, 2^1223455591 is an apocalyptic number.

1223455591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223455591 is an equidigital number, since it uses as much as digits as its factorization.

1223455591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 37.

The square root of 1223455591 is about 34977.9300559653. The cubic root of 1223455591 is about 1069.5376320645.

The spelling of 1223455591 in words is "one billion, two hundred twenty-three million, four hundred fifty-five thousand, five hundred ninety-one".