81416853 has 32 divisors (see below), whose sum is σ = 139301120. Its totient is φ = 46033920.

The previous prime is 81416837. The next prime is 81416861. The reversal of 81416853 is 35861418.

It is not a de Polignac number, because 81416853 - 2⁴ = 81416837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81416813) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 16113 + ... + 20553.

It is an arithmetic number, because the mean of its divisors is an integer number (4353160).

Almost surely, 2^81416853 is an apocalyptic number.

It is an amenable number.

81416853 is a deficient number, since it is larger than the sum of its proper divisors (57884267).

81416853 is a wasteful number, since it uses less digits than its factorization.

81416853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4554 (or 4548 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 81416853 is about 9023.1287810825. The cubic root of 81416853 is about 433.4158311702.

The spelling of 81416853 in words is "eighty-one million, four hundred sixteen thousand, eight hundred fifty-three".