1189428681 has 16 divisors (see below), whose sum is σ = 1919078784. Its totient is φ = 639692544.

The previous prime is 1189428679. The next prime is 1189428743. The reversal of 1189428681 is 1868249811.

It is not a de Polignac number, because 1189428681 - 2¹ = 1189428679 is a prime.

It is a super-2 number, since 2×1189428681² = 2829481174370799522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1189428681.

It is not an unprimeable number, because it can be changed into a prime (1189428641) 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 15 ways as a sum of consecutive naturals, for example, 1665510 + ... + 1666223.

It is an arithmetic number, because the mean of its divisors is an integer number (119942424).

Almost surely, 2^1189428681 is an apocalyptic number.

It is an amenable number.

1189428681 is a deficient number, since it is larger than the sum of its proper divisors (729650103).

1189428681 is a wasteful number, since it uses less digits than its factorization.

1189428681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331760.

The product of its digits is 221184, while the sum is 48.

The square root of 1189428681 is about 34488.0947719644. The cubic root of 1189428681 is about 1059.5288878944.

The spelling of 1189428681 in words is "one billion, one hundred eighty-nine million, four hundred twenty-eight thousand, six hundred eighty-one".