81996711 has 4 divisors (see below), whose sum is σ = 109328952. Its totient is φ = 54664472.

The previous prime is 81996701. The next prime is 81996721. The reversal of 81996711 is 11769918.

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

It is an interprime number because it is at equal distance from previous prime (81996701) and next prime (81996721).

It is a cyclic number.

It is not a de Polignac number, because 81996711 - 2¹⁰ = 81995687 is a prime.

It is a super-2 number, since 2×81996711² = 13446921229635042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81996701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13666116 + ... + 13666121.

It is an arithmetic number, because the mean of its divisors is an integer number (27332238).

Almost surely, 2^81996711 is an apocalyptic number.

81996711 is a deficient number, since it is larger than the sum of its proper divisors (27332241).

81996711 is a wasteful number, since it uses less digits than its factorization.

81996711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27332240.

The product of its digits is 27216, while the sum is 42.

The square root of 81996711 is about 9055.2035316717. The cubic root of 81996711 is about 434.4423399628.

The spelling of 81996711 in words is "eighty-one million, nine hundred ninety-six thousand, seven hundred eleven".