81365235 has 48 divisors (see below), whose sum is σ = 156367872. Its totient is φ = 35985600.

The previous prime is 81365203. The next prime is 81365287. The reversal of 81365235 is 53256318.

It is not a de Polignac number, because 81365235 - 2⁵ = 81365203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81365196 and 81365205.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21000 + ... + 24570.

It is an arithmetic number, because the mean of its divisors is an integer number (3257664).

Almost surely, 2^81365235 is an apocalyptic number.

81365235 is a deficient number, since it is larger than the sum of its proper divisors (75002637).

81365235 is a wasteful number, since it uses less digits than its factorization.

81365235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3624 (or 3617 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 81365235 is about 9020.2680115393. The cubic root of 81365235 is about 433.3242170995.

The spelling of 81365235 in words is "eighty-one million, three hundred sixty-five thousand, two hundred thirty-five".