81435 has 16 divisors (see below), whose sum is σ = 133920. Its totient is φ = 42240.

The previous prime is 81421. The next prime is 81439. The reversal of 81435 is 53418.

81435 = T₁₃₀ + T₁₃₁ + ... + T₁₃₈.

It is not a de Polignac number, because 81435 - 2⁶ = 81371 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81435.

It is not an unprimeable number, because it can be changed into a prime (81439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871 + ... + 959.

It is an arithmetic number, because the mean of its divisors is an integer number (8370).

2⁸¹⁴³⁵ is an apocalyptic number.

81435 is a deficient number, since it is larger than the sum of its proper divisors (52485).

81435 is a wasteful number, since it uses less digits than its factorization.

81435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158.

The product of its digits is 480, while the sum is 21.

The square root of 81435 is about 285.3681832300. The cubic root of 81435 is about 43.3448030125.

The spelling of 81435 in words is "eighty-one thousand, four hundred thirty-five".