80005381 has 2 divisors, whose sum is σ = 80005382. Its totient is φ = 80005380.

The previous prime is 80005379. The next prime is 80005441. The reversal of 80005381 is 18350008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73805281 + 6200100 = 8591^2 + 2490^2 .

It is a cyclic number.

It is not a de Polignac number, because 80005381 - 2¹ = 80005379 is a prime.

It is a super-2 number, since 2×80005381² = 12801721977910322, which contains 22 as substring.

Together with 80005379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80009381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40002690 + 40002691.

It is an arithmetic number, because the mean of its divisors is an integer number (40002691).

Almost surely, 2^80005381 is an apocalyptic number.

It is an amenable number.

80005381 is a deficient number, since it is larger than the sum of its proper divisors (1).

80005381 is an equidigital number, since it uses as much as digits as its factorization.

80005381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 80005381 is about 8944.5727119857. The cubic root of 80005381 is about 430.8965986340.

Adding to 80005381 its reverse (18350008), we get a palindrome (98355389).

The spelling of 80005381 in words is "eighty million, five thousand, three hundred eighty-one".