8378581 has 2 divisors, whose sum is σ = 8378582. Its totient is φ = 8378580.

The previous prime is 8378567. The next prime is 8378621. The reversal of 8378581 is 1858738.

It is an a-pointer prime, because the next prime (8378621) can be obtained adding 8378581 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6916900 + 1461681 = 2630^2 + 1209^2 .

It is a cyclic number.

It is not a de Polignac number, because 8378581 - 2¹⁷ = 8247509 is a prime.

It is a super-2 number, since 2×8378581² = 140401239147122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8378521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4189290 + 4189291.

It is an arithmetic number, because the mean of its divisors is an integer number (4189291).

Almost surely, 2^8378581 is an apocalyptic number.

It is an amenable number.

8378581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8378581 is an equidigital number, since it uses as much as digits as its factorization.

8378581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 40.

The square root of 8378581 is about 2894.5778621416. The cubic root of 8378581 is about 203.1063449850.

The spelling of 8378581 in words is "eight million, three hundred seventy-eight thousand, five hundred eighty-one".