1198556659 has 4 divisors (see below), whose sum is σ = 1198747800. Its totient is φ = 1198365520.

The previous prime is 1198556617. The next prime is 1198556663. The reversal of 1198556659 is 9566558911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1198556659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198556699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85834 + ... + 98815.

It is an arithmetic number, because the mean of its divisors is an integer number (299686950).

Almost surely, 2^1198556659 is an apocalyptic number.

1198556659 is a deficient number, since it is larger than the sum of its proper divisors (191141).

1198556659 is an equidigital number, since it uses as much as digits as its factorization.

1198556659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191140.

The product of its digits is 2916000, while the sum is 55.

The square root of 1198556659 is about 34620.1770503849. The cubic root of 1198556659 is about 1062.2323486193.

It can be divided in two parts, 11985 and 56659, that added together give a square (68644 = 262²).

The spelling of 1198556659 in words is "one billion, one hundred ninety-eight million, five hundred fifty-six thousand, six hundred fifty-nine".