81852511 has 8 divisors (see below), whose sum is σ = 89812800. Its totient is φ = 74129952.

The previous prime is 81852509. The next prime is 81852541. The reversal of 81852511 is 11525818.

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

It is not a de Polignac number, because 81852511 - 2¹ = 81852509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81852541) 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, 58711 + ... + 60088.

It is an arithmetic number, because the mean of its divisors is an integer number (11226600).

Almost surely, 2^81852511 is an apocalyptic number.

81852511 is a deficient number, since it is larger than the sum of its proper divisors (7960289).

81852511 is a wasteful number, since it uses less digits than its factorization.

81852511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118865.

The product of its digits is 3200, while the sum is 31.

The square root of 81852511 is about 9047.2377552488. The cubic root of 81852511 is about 434.1875193968.

The spelling of 81852511 in words is "eighty-one million, eight hundred fifty-two thousand, five hundred eleven".