81000371 has 2 divisors, whose sum is σ = 81000372. Its totient is φ = 81000370.

The previous prime is 81000343. The next prime is 81000389. The reversal of 81000371 is 17300018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81000371 - 2¹⁸ = 80738227 is a prime.

It is a super-2 number, since 2×81000371² = 13122120204275282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81000071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40500185 + 40500186.

It is an arithmetic number, because the mean of its divisors is an integer number (40500186).

Almost surely, 2^81000371 is an apocalyptic number.

81000371 is a deficient number, since it is larger than the sum of its proper divisors (1).

81000371 is an equidigital number, since it uses as much as digits as its factorization.

81000371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 81000371 is about 9000.0206110875. The cubic root of 81000371 is about 432.6755316771.

Adding to 81000371 its reverse (17300018), we get a palindrome (98300389).

The spelling of 81000371 in words is "eighty-one million, three hundred seventy-one", and thus it is an aban number.