81354245 has 16 divisors (see below), whose sum is σ = 111884160. Its totient is φ = 55629504.

The previous prime is 81354239. The next prime is 81354269. The reversal of 81354245 is 54245318.

It is not a de Polignac number, because 81354245 - 2¹⁸ = 81092101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10199 + ... + 16331.

It is an arithmetic number, because the mean of its divisors is an integer number (6992760).

Almost surely, 2^81354245 is an apocalyptic number.

It is an amenable number.

81354245 is a deficient number, since it is larger than the sum of its proper divisors (30529915).

81354245 is a wasteful number, since it uses less digits than its factorization.

81354245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6524.

The product of its digits is 19200, while the sum is 32.

The square root of 81354245 is about 9019.6588072942. The cubic root of 81354245 is about 433.3047065244.

The spelling of 81354245 in words is "eighty-one million, three hundred fifty-four thousand, two hundred forty-five".