81038983 has 4 divisors (see below), whose sum is σ = 85806000. Its totient is φ = 76271968.

The previous prime is 81038957. The next prime is 81038989. The reversal of 81038983 is 38983018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81038983 - 2⁹ = 81038471 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81038989) 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 3 ways as a sum of consecutive naturals, for example, 2383483 + ... + 2383516.

It is an arithmetic number, because the mean of its divisors is an integer number (21451500).

Almost surely, 2^81038983 is an apocalyptic number.

81038983 is a deficient number, since it is larger than the sum of its proper divisors (4767017).

81038983 is a wasteful number, since it uses less digits than its factorization.

81038983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4767016.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 81038983 is about 9002.1654617098. The cubic root of 81038983 is about 432.7442713365.

It can be divided in two parts, 810 and 38983, that added together give a palindrome (39793).

The spelling of 81038983 in words is "eighty-one million, thirty-eight thousand, nine hundred eighty-three".