81854045 has 16 divisors (see below), whose sum is σ = 120892800. Its totient is φ = 51810624.

The previous prime is 81854041. The next prime is 81854051. The reversal of 81854045 is 54045818.

It is a cyclic number.

It is not a de Polignac number, because 81854045 - 2² = 81854041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a junction number, because it is equal to n+sod(n) for n = 81853996 and 81854014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81854041) 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, 89495 + ... + 90404.

It is an arithmetic number, because the mean of its divisors is an integer number (7555800).

Almost surely, 2^81854045 is an apocalyptic number.

It is an amenable number.

81854045 is a deficient number, since it is larger than the sum of its proper divisors (39038755).

81854045 is a wasteful number, since it uses less digits than its factorization.

81854045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179924.

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 81854045 is about 9047.3225321086. The cubic root of 81854045 is about 434.1902317530.

The spelling of 81854045 in words is "eighty-one million, eight hundred fifty-four thousand, forty-five".