1158881645 has 4 divisors (see below), whose sum is σ = 1390657980. Its totient is φ = 927105312.

The previous prime is 1158881639. The next prime is 1158881651. The reversal of 1158881645 is 5461888511.

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

It is an interprime number because it is at equal distance from previous prime (1158881639) and next prime (1158881651).

It can be written as a sum of positive squares in 2 ways, for example, as 679227844 + 479653801 = 26062^2 + 21901^2 .

It is a cyclic number.

It is not a de Polignac number, because 1158881645 - 2¹⁴ = 1158865261 is a prime.

It is a super-3 number, since 3×1158881645³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1158881645.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 115888160 + ... + 115888169.

It is an arithmetic number, because the mean of its divisors is an integer number (347664495).

Almost surely, 2^1158881645 is an apocalyptic number.

It is an amenable number.

1158881645 is a deficient number, since it is larger than the sum of its proper divisors (231776335).

1158881645 is an equidigital number, since it uses as much as digits as its factorization.

1158881645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231776334.

The product of its digits is 307200, while the sum is 47.

The square root of 1158881645 is about 34042.3507560803. The cubic root of 1158881645 is about 1050.3798006236.

The spelling of 1158881645 in words is "one billion, one hundred fifty-eight million, eight hundred eighty-one thousand, six hundred forty-five".