81408134 has 4 divisors (see below), whose sum is σ = 122112204. Its totient is φ = 40704066.

The previous prime is 81408101. The next prime is 81408161. The reversal of 81408134 is 43180418.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 81408097 and 81408106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20352032 + ... + 20352035.

It is an arithmetic number, because the mean of its divisors is an integer number (30528051).

Almost surely, 2^81408134 is an apocalyptic number.

81408134 is a deficient number, since it is larger than the sum of its proper divisors (40704070).

81408134 is a wasteful number, since it uses less digits than its factorization.

81408134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40704069.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 81408134 is about 9022.6456208808. The cubic root of 81408134 is about 433.4003589946.

The spelling of 81408134 in words is "eighty-one million, four hundred eight thousand, one hundred thirty-four".