81963801 has 6 divisors (see below), whose sum is σ = 118392170. Its totient is φ = 54642528.

The previous prime is 81963787. The next prime is 81963839. The reversal of 81963801 is 10836918.

81963801 is a `hidden beast` number, since 8 + 19 + 638 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 42575625 + 39388176 = 6525^2 + 6276^2 .

It is not a de Polignac number, because 81963801 - 2¹³ = 81955609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81963841) 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 5 ways as a sum of consecutive naturals, for example, 4553536 + ... + 4553553.

Almost surely, 2^81963801 is an apocalyptic number.

It is an amenable number.

81963801 is a deficient number, since it is larger than the sum of its proper divisors (36428369).

81963801 is a wasteful number, since it uses less digits than its factorization.

81963801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9107095 (or 9107092 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 81963801 is about 9053.3861620943. The cubic root of 81963801 is about 434.3842099457.

It can be divided in two parts, 819 and 63801, that added together give a triangular number (64620 = T₃₅₉).

The spelling of 81963801 in words is "eighty-one million, nine hundred sixty-three thousand, eight hundred one".