81545935 has 4 divisors (see below), whose sum is σ = 97855128. Its totient is φ = 65236744.

The previous prime is 81545927. The next prime is 81545951. The reversal of 81545935 is 53954518.

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

It is a cyclic number.

It is not a de Polignac number, because 81545935 - 2³ = 81545927 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8154589 + ... + 8154598.

It is an arithmetic number, because the mean of its divisors is an integer number (24463782).

Almost surely, 2^81545935 is an apocalyptic number.

81545935 is a deficient number, since it is larger than the sum of its proper divisors (16309193).

81545935 is a wasteful number, since it uses less digits than its factorization.

81545935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16309192.

The product of its digits is 108000, while the sum is 40.

The square root of 81545935 is about 9030.2787886089. The cubic root of 81545935 is about 433.6447626494.

The spelling of 81545935 in words is "eighty-one million, five hundred forty-five thousand, nine hundred thirty-five".