81849711 has 8 divisors (see below), whose sum is σ = 109195264. Its totient is φ = 54535320.

The previous prime is 81849707. The next prime is 81849721. The reversal of 81849711 is 11794818.

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

It is not a de Polignac number, because 81849711 - 2² = 81849707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81849711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81849721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751 + ... + 12816.

It is an arithmetic number, because the mean of its divisors is an integer number (13649408).

Almost surely, 2^81849711 is an apocalyptic number.

81849711 is a deficient number, since it is larger than the sum of its proper divisors (27345553).

81849711 is a wasteful number, since it uses less digits than its factorization.

81849711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15581.

The product of its digits is 16128, while the sum is 39.

The square root of 81849711 is about 9047.0830105620. The cubic root of 81849711 is about 434.1825684637.

The spelling of 81849711 in words is "eighty-one million, eight hundred forty-nine thousand, seven hundred eleven".