81477 has 12 divisors (see below), whose sum is σ = 128544. Its totient is φ = 49320.

The previous prime is 81463. The next prime is 81509. The reversal of 81477 is 77418.

It is not a de Polignac number, because 81477 - 2⁷ = 81349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81477.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81477.

It is not an unprimeable number, because it can be changed into a prime (81457) 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, 313 + ... + 510.

It is an arithmetic number, because the mean of its divisors is an integer number (10712).

2⁸¹⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

81477 is a deficient number, since it is larger than the sum of its proper divisors (47067).

81477 is a wasteful number, since it uses less digits than its factorization.

81477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 837 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 81477 is about 285.4417628869. The cubic root of 81477 is about 43.3522534079.

It can be divided in two parts, 8 and 1477, that added together give a triangular number (1485 = T₅₄).

The spelling of 81477 in words is "eighty-one thousand, four hundred seventy-seven".