81352851 has 16 divisors (see below), whose sum is σ = 114576000. Its totient is φ = 51202368.

The previous prime is 81352829. The next prime is 81352867. The reversal of 81352851 is 15825318.

It is a happy number.

It is not a de Polignac number, because 81352851 - 2⁵ = 81352819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81352151) 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 15 ways as a sum of consecutive naturals, for example, 15175 + ... + 19823.

It is an arithmetic number, because the mean of its divisors is an integer number (7161000).

Almost surely, 2^81352851 is an apocalyptic number.

81352851 is a deficient number, since it is larger than the sum of its proper divisors (33223149).

81352851 is a wasteful number, since it uses less digits than its factorization.

81352851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4978.

The product of its digits is 9600, while the sum is 33.

The square root of 81352851 is about 9019.5815313129. The cubic root of 81352851 is about 433.3022316271.

The spelling of 81352851 in words is "eighty-one million, three hundred fifty-two thousand, eight hundred fifty-one".