8781381 has 12 divisors (see below), whose sum is σ = 14496352. Its totient is φ = 5017896.

The previous prime is 8781379. The next prime is 8781397. The reversal of 8781381 is 1831878.

It is not a de Polignac number, because 8781381 - 2¹ = 8781379 is a prime.

It is a super-2 number, since 2×8781381² = 154225304534322, 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 (8781301) 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 11 ways as a sum of consecutive naturals, for example, 69631 + ... + 69756.

Almost surely, 2^8781381 is an apocalyptic number.

It is an amenable number.

8781381 is a deficient number, since it is larger than the sum of its proper divisors (5714971).

8781381 is a wasteful number, since it uses less digits than its factorization.

8781381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139400 (or 139397 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 8781381 is about 2963.3395013059. The cubic root of 8781381 is about 206.3103140410.

The spelling of 8781381 in words is "eight million, seven hundred eighty-one thousand, three hundred eighty-one".