81314741873 has 4 divisors (see below), whose sum is σ = 81527052288. Its totient is φ = 81102431460.

The previous prime is 81314741869. The next prime is 81314741923. The reversal of 81314741873 is 37814741318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81314741873 - 2² = 81314741869 is a prime.

It is a super-3 number, since 3×81314741873³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81314741843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106154633 + ... + 106155398.

It is an arithmetic number, because the mean of its divisors is an integer number (20381763072).

Almost surely, 2^81314741873 is an apocalyptic number.

It is an amenable number.

81314741873 is a deficient number, since it is larger than the sum of its proper divisors (212310415).

81314741873 is a wasteful number, since it uses less digits than its factorization.

81314741873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212310414.

The product of its digits is 451584, while the sum is 47.

The spelling of 81314741873 in words is "eighty-one billion, three hundred fourteen million, seven hundred forty-one thousand, eight hundred seventy-three".