81339801 has 16 divisors (see below), whose sum is σ = 112963968. Its totient is φ = 52012800.

The previous prime is 81339793. The next prime is 81339803. The reversal of 81339801 is 10893318.

It is not a de Polignac number, because 81339801 - 2³ = 81339793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81339803) 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, 2721 + ... + 13041.

It is an arithmetic number, because the mean of its divisors is an integer number (7060248).

Almost surely, 2^81339801 is an apocalyptic number.

It is an amenable number.

81339801 is a deficient number, since it is larger than the sum of its proper divisors (31624167).

81339801 is a wasteful number, since it uses less digits than its factorization.

81339801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10432.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 81339801 is about 9018.8580762755. The cubic root of 81339801 is about 433.2790613819.

The spelling of 81339801 in words is "eighty-one million, three hundred thirty-nine thousand, eight hundred one".