81455427 has 12 divisors (see below), whose sum is σ = 117903864. Its totient is φ = 54190080.

The previous prime is 81455417. The next prime is 81455431. The reversal of 81455427 is 72455418.

81455427 is a `hidden beast` number, since 81 + 4 + 554 + 27 = 666.

It is not a de Polignac number, because 81455427 - 2¹⁰ = 81454403 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81455391 and 81455400.

It is not an unprimeable number, because it can be changed into a prime (81455417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4798 + ... + 13635.

It is an arithmetic number, because the mean of its divisors is an integer number (9825322).

Almost surely, 2^81455427 is an apocalyptic number.

81455427 is a deficient number, since it is larger than the sum of its proper divisors (36448437).

81455427 is a wasteful number, since it uses less digits than its factorization.

81455427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18930 (or 18927 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 81455427 is about 9025.2660348601. The cubic root of 81455427 is about 433.4842688544.

Subtracting from 81455427 its reverse (72455418), we obtain a palindrome (9000009).

The spelling of 81455427 in words is "eighty-one million, four hundred fifty-five thousand, four hundred twenty-seven".