81347351 has 2 divisors, whose sum is σ = 81347352. Its totient is φ = 81347350.

The previous prime is 81347347. The next prime is 81347359. The reversal of 81347351 is 15374318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81347351 - 2² = 81347347 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81347359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40673675 + 40673676.

It is an arithmetic number, because the mean of its divisors is an integer number (40673676).

Almost surely, 2^81347351 is an apocalyptic number.

81347351 is a deficient number, since it is larger than the sum of its proper divisors (1).

81347351 is an equidigital number, since it uses as much as digits as its factorization.

81347351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 81347351 is about 9019.2766339657. The cubic root of 81347351 is about 433.2924666918.

The spelling of 81347351 in words is "eighty-one million, three hundred forty-seven thousand, three hundred fifty-one".