81711351 has 12 divisors (see below), whose sum is σ = 118490112. Its totient is φ = 54260736.

The previous prime is 81711307. The next prime is 81711353. The reversal of 81711351 is 15311718.

It is not a de Polignac number, because 81711351 - 2¹³ = 81703159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81711353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15351 + ... + 19976.

It is an arithmetic number, because the mean of its divisors is an integer number (9874176).

Almost surely, 2^81711351 is an apocalyptic number.

81711351 is a deficient number, since it is larger than the sum of its proper divisors (36778761).

81711351 is a wasteful number, since it uses less digits than its factorization.

81711351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35590 (or 35587 counting only the distinct ones).

The product of its digits is 840, while the sum is 27.

The square root of 81711351 is about 9039.4331127566. The cubic root of 81711351 is about 433.9377808687.

The spelling of 81711351 in words is "eighty-one million, seven hundred eleven thousand, three hundred fifty-one".