81015711 has 8 divisors (see below), whose sum is σ = 123452544. Its totient is φ = 46294680.

The previous prime is 81015709. The next prime is 81015749. The reversal of 81015711 is 11751018.

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

It is not a de Polignac number, because 81015711 - 2¹ = 81015709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81015511) 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, 1928925 + ... + 1928966.

It is an arithmetic number, because the mean of its divisors is an integer number (15431568).

Almost surely, 2^81015711 is an apocalyptic number.

81015711 is a deficient number, since it is larger than the sum of its proper divisors (42436833).

81015711 is a wasteful number, since it uses less digits than its factorization.

81015711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3857901.

The product of its (nonzero) digits is 280, while the sum is 24.

The square root of 81015711 is about 9000.8727910131. The cubic root of 81015711 is about 432.7028435838.

Adding to 81015711 its reverse (11751018), we get a palindrome (92766729).

The spelling of 81015711 in words is "eighty-one million, fifteen thousand, seven hundred eleven".