8005691381 has 2 divisors, whose sum is σ = 8005691382. Its totient is φ = 8005691380.

The previous prime is 8005691341. The next prime is 8005691383. The reversal of 8005691381 is 1831965008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7483980100 + 521711281 = 86510^2 + 22841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8005691381 is a prime.

It is a super-2 number, since 2×8005691381² (a number of 21 digits) contains 22 as substring.

Together with 8005691383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8005691383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4002845690 + 4002845691.

It is an arithmetic number, because the mean of its divisors is an integer number (4002845691).

Almost surely, 2^8005691381 is an apocalyptic number.

It is an amenable number.

8005691381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8005691381 is an equidigital number, since it uses as much as digits as its factorization.

8005691381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 8005691381 is about 89474.5292303905. The cubic root of 8005691381 is about 2000.4741693228.

The spelling of 8005691381 in words is "eight billion, five million, six hundred ninety-one thousand, three hundred eighty-one".