8115381 has 6 divisors (see below), whose sum is σ = 11722230. Its totient is φ = 5410248.

The previous prime is 8115313. The next prime is 8115383. The reversal of 8115381 is 1835118.

It can be written as a sum of positive squares in only one way, i.e., 8071281 + 44100 = 2841^2 + 210^2 .

It is not a de Polignac number, because 8115381 - 2¹⁹ = 7591093 is a prime.

It is a super-2 number, since 2×8115381² = 131718817550322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8115383) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 450846 + ... + 450863.

It is an arithmetic number, because the mean of its divisors is an integer number (1953705).

Almost surely, 2^8115381 is an apocalyptic number.

It is an amenable number.

8115381 is a deficient number, since it is larger than the sum of its proper divisors (3606849).

8115381 is a wasteful number, since it uses less digits than its factorization.

8115381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901715 (or 901712 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 8115381 is about 2848.7507788503. The cubic root of 8115381 is about 200.9569225276.

The spelling of 8115381 in words is "eight million, one hundred fifteen thousand, three hundred eighty-one".