1138607581 has 8 divisors (see below), whose sum is σ = 1156508640. Its totient is φ = 1120733328.

The previous prime is 1138607579. The next prime is 1138607593. The reversal of 1138607581 is 1857068311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1138607581 - 2¹ = 1138607579 is a prime.

It is a super-2 number, since 2×1138607581² = 2592854447021343122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138607531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89655 + ... + 101563.

It is an arithmetic number, because the mean of its divisors is an integer number (144563580).

Almost surely, 2^1138607581 is an apocalyptic number.

It is an amenable number.

1138607581 is a deficient number, since it is larger than the sum of its proper divisors (17901059).

1138607581 is a wasteful number, since it uses less digits than its factorization.

1138607581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13403.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 1138607581 is about 33743.2597862151. The cubic root of 1138607581 is about 1044.2184371519.

The spelling of 1138607581 in words is "one billion, one hundred thirty-eight million, six hundred seven thousand, five hundred eighty-one".