81347367 has 4 divisors (see below), whose sum is σ = 108463160. Its totient is φ = 54231576.

The previous prime is 81347359. The next prime is 81347369. The reversal of 81347367 is 76374318.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81347367 - 2³ = 81347359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81347369) 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 in 3 ways as a sum of consecutive naturals, for example, 13557892 + ... + 13557897.

It is an arithmetic number, because the mean of its divisors is an integer number (27115790).

Almost surely, 2^81347367 is an apocalyptic number.

81347367 is a deficient number, since it is larger than the sum of its proper divisors (27115793).

81347367 is a wasteful number, since it uses less digits than its factorization.

81347367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27115792.

The product of its digits is 84672, while the sum is 39.

The square root of 81347367 is about 9019.2775209548. The cubic root of 81347367 is about 433.2924950995.

The spelling of 81347367 in words is "eighty-one million, three hundred forty-seven thousand, three hundred sixty-seven".