1195581643 has 2 divisors, whose sum is σ = 1195581644. Its totient is φ = 1195581642.

The previous prime is 1195581613. The next prime is 1195581671. The reversal of 1195581643 is 3461855911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1195581643 - 2⁹ = 1195581131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1195581643.

It is not a weakly prime, because it can be changed into another prime (1195581613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 597790821 + 597790822.

It is an arithmetic number, because the mean of its divisors is an integer number (597790822).

Almost surely, 2^1195581643 is an apocalyptic number.

1195581643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1195581643 is an equidigital number, since it uses as much as digits as its factorization.

1195581643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 43.

The square root of 1195581643 is about 34577.1838500477. The cubic root of 1195581643 is about 1061.3527416077.

The spelling of 1195581643 in words is "one billion, one hundred ninety-five million, five hundred eighty-one thousand, six hundred forty-three".