1198478909 has 2 divisors, whose sum is σ = 1198478910. Its totient is φ = 1198478908.

The previous prime is 1198478899. The next prime is 1198478933. The reversal of 1198478909 is 9098748911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1072366009 + 126112900 = 32747^2 + 11230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1198478909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1198478959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599239454 + 599239455.

It is an arithmetic number, because the mean of its divisors is an integer number (599239455).

Almost surely, 2^1198478909 is an apocalyptic number.

It is an amenable number.

1198478909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198478909 is an equidigital number, since it uses as much as digits as its factorization.

1198478909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The square root of 1198478909 is about 34619.0541320817. The cubic root of 1198478909 is about 1062.2093792279.

The spelling of 1198478909 in words is "one billion, one hundred ninety-eight million, four hundred seventy-eight thousand, nine hundred nine".