1189668061 has 4 divisors (see below), whose sum is σ = 1189746972. Its totient is φ = 1189589152.

The previous prime is 1189668017. The next prime is 1189668097. The reversal of 1189668061 is 1608669811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 980316100 + 209351961 = 31310^2 + 14469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1189668061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189668661) 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 in 3 ways as a sum of consecutive naturals, for example, 9010 + ... + 49603.

It is an arithmetic number, because the mean of its divisors is an integer number (297436743).

Almost surely, 2^1189668061 is an apocalyptic number.

It is an amenable number.

1189668061 is a deficient number, since it is larger than the sum of its proper divisors (78911).

1189668061 is an equidigital number, since it uses as much as digits as its factorization.

1189668061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78910.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 1189668061 is about 34491.5650703183. The cubic root of 1189668061 is about 1059.5999620765.

The spelling of 1189668061 in words is "one billion, one hundred eighty-nine million, six hundred sixty-eight thousand, sixty-one".