81852945 has 8 divisors (see below), whose sum is σ = 130964736. Its totient is φ = 43654896.

The previous prime is 81852937. The next prime is 81852971. The reversal of 81852945 is 54925818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81852945 - 2³ = 81852937 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81852897 and 81852906.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2728417 + ... + 2728446.

It is an arithmetic number, because the mean of its divisors is an integer number (16370592).

Almost surely, 2^81852945 is an apocalyptic number.

It is an amenable number.

81852945 is a deficient number, since it is larger than the sum of its proper divisors (49111791).

81852945 is a wasteful number, since it uses less digits than its factorization.

81852945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5456871.

The product of its digits is 115200, while the sum is 42.

The square root of 81852945 is about 9047.2617404384. The cubic root of 81852945 is about 434.1882867813.

The spelling of 81852945 in words is "eighty-one million, eight hundred fifty-two thousand, nine hundred forty-five".