81256527 has 28 divisors (see below), whose sum is σ = 132917544. Its totient is φ = 49241520.

The previous prime is 81256507. The next prime is 81256531. The reversal of 81256527 is 72565218.

It is a happy number.

81256527 is a `hidden beast` number, since 8 + 125 + 6 + 527 = 666.

It is not a de Polignac number, because 81256527 - 2²⁶ = 14147663 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81256491 and 81256500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81256507) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2953 + ... + 13085.

Almost surely, 2^81256527 is an apocalyptic number.

81256527 is a deficient number, since it is larger than the sum of its proper divisors (51661017).

81256527 is a wasteful number, since it uses less digits than its factorization.

81256527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10162 (or 10147 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 81256527 is about 9014.2402342072. The cubic root of 81256527 is about 433.1311501910.

The spelling of 81256527 in words is "eighty-one million, two hundred fifty-six thousand, five hundred twenty-seven".