1138866605 has 4 divisors (see below), whose sum is σ = 1366639932. Its totient is φ = 911093280.

The previous prime is 1138866473. The next prime is 1138866611. The reversal of 1138866605 is 5066688311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5066688311 = 109 ⋅46483379.

It can be written as a sum of positive squares in 2 ways, for example, as 341030089 + 797836516 = 18467^2 + 28246^2 .

It is not a de Polignac number, because 1138866605 - 2⁸ = 1138866349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 113886656 + ... + 113886665.

It is an arithmetic number, because the mean of its divisors is an integer number (341659983).

Almost surely, 2^1138866605 is an apocalyptic number.

It is an amenable number.

1138866605 is a deficient number, since it is larger than the sum of its proper divisors (227773327).

1138866605 is an equidigital number, since it uses as much as digits as its factorization.

1138866605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227773326.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 1138866605 is about 33747.0977270639. The cubic root of 1138866605 is about 1044.2976148930.

The spelling of 1138866605 in words is "one billion, one hundred thirty-eight million, eight hundred sixty-six thousand, six hundred five".