81335527 has 8 divisors (see below), whose sum is σ = 100105376. Its totient is φ = 64353312.

The previous prime is 81335483. The next prime is 81335539. The reversal of 81335527 is 72553318.

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

It is a cyclic number.

It is not a de Polignac number, because 81335527 - 2¹⁹ = 80811239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81335492 and 81335501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81335557) 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, 446808 + ... + 446989.

It is an arithmetic number, because the mean of its divisors is an integer number (12513172).

Almost surely, 2^81335527 is an apocalyptic number.

81335527 is a deficient number, since it is larger than the sum of its proper divisors (18769849).

81335527 is a wasteful number, since it uses less digits than its factorization.

81335527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893817.

The product of its digits is 25200, while the sum is 34.

The square root of 81335527 is about 9018.6211252053. The cubic root of 81335527 is about 433.2714723660.

The spelling of 81335527 in words is "eighty-one million, three hundred thirty-five thousand, five hundred twenty-seven".