81307709311 has 8 divisors (see below), whose sum is σ = 81980186960. Its totient is φ = 80636482368.

The previous prime is 81307709281. The next prime is 81307709317. The reversal of 81307709311 is 11390770318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81307709311 - 2¹⁷ = 81307578239 is a prime.

It is a super-2 number, since 2×81307709311² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81307709317) 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 7 ways as a sum of consecutive naturals, for example, 181896 + ... + 442381.

It is an arithmetic number, because the mean of its divisors is an integer number (10247523370).

Almost surely, 2^81307709311 is an apocalyptic number.

81307709311 is a deficient number, since it is larger than the sum of its proper divisors (672477649).

81307709311 is a wasteful number, since it uses less digits than its factorization.

81307709311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625353.

The product of its (nonzero) digits is 31752, while the sum is 40.

The spelling of 81307709311 in words is "eighty-one billion, three hundred seven million, seven hundred nine thousand, three hundred eleven".