8381313 has 14 divisors (see below), whose sum is σ = 12567314. Its totient is φ = 5587056.

The previous prime is 8381311. The next prime is 8381333. The reversal of 8381313 is 3131838.

It can be written as a sum of positive squares in only one way, i.e., 7436529 + 944784 = 2727^2 + 972^2 .

It is not a de Polignac number, because 8381313 - 2¹ = 8381311 is a prime.

It is a super-3 number, since 3×8381313³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8381311) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 5020 + ... + 6477.

Almost surely, 2^8381313 is an apocalyptic number.

It is an amenable number.

8381313 is a deficient number, since it is larger than the sum of its proper divisors (4186001).

8381313 is an equidigital number, since it uses as much as digits as its factorization.

8381313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11515 (or 11500 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 8381313 is about 2895.0497405053. The cubic root of 8381313 is about 203.1284181831.

The spelling of 8381313 in words is "eight million, three hundred eighty-one thousand, three hundred thirteen".