1138881671 has 4 divisors (see below), whose sum is σ = 1138953144. Its totient is φ = 1138810200.

The previous prime is 1138881607. The next prime is 1138881673. The reversal of 1138881671 is 1761888311.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1761888311 = 37 ⋅47618603.

It is a cyclic number.

It is not a de Polignac number, because 1138881671 - 2⁶ = 1138881607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138881673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236 + ... + 47726.

It is an arithmetic number, because the mean of its divisors is an integer number (284738286).

Almost surely, 2^1138881671 is an apocalyptic number.

1138881671 is a deficient number, since it is larger than the sum of its proper divisors (71473).

1138881671 is an equidigital number, since it uses as much as digits as its factorization.

1138881671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71472.

The product of its digits is 64512, while the sum is 44.

The square root of 1138881671 is about 33747.3209455210. The cubic root of 1138881671 is about 1044.3022198568.

The spelling of 1138881671 in words is "one billion, one hundred thirty-eight million, eight hundred eighty-one thousand, six hundred seventy-one".