1158789681 has 27 divisors (see below), whose sum is σ = 1948283883. Its totient is φ = 661757040.

The previous prime is 1158789679. The next prime is 1158789707. The reversal of 1158789681 is 1869878511.

It is a happy number.

The square root of 1158789681 is 34041.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 890485281 + 268304400 = 29841^2 + 16380^2 .

It is not a de Polignac number, because 1158789681 - 2¹ = 1158789679 is a prime.

It is a super-4 number, since 4×1158789681⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1158789661) 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 in 26 ways as a sum of consecutive naturals, for example, 714051 + ... + 715671.

Almost surely, 2^1158789681 is an apocalyptic number.

1158789681 is the 34041-st square number.

1158789681 is the 17021-st centered octagonal number.

It is an amenable number.

1158789681 is a deficient number, since it is larger than the sum of its proper divisors (789494202).

1158789681 is an frugal number, since it uses more digits than its factorization.

1158789681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262 (or 1631 counting only the distinct ones).

The product of its digits is 967680, while the sum is 54.

The cubic root of 1158789681 is about 1050.3520153061.

The spelling of 1158789681 in words is "one billion, one hundred fifty-eight million, seven hundred eighty-nine thousand, six hundred eighty-one".