81838753 has 4 divisors (see below), whose sum is σ = 82633408. Its totient is φ = 81044100.

The previous prime is 81838751. The next prime is 81838763. The reversal of 81838753 is 35783818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81838753 - 2¹ = 81838751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81838751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397173 + ... + 397378.

It is an arithmetic number, because the mean of its divisors is an integer number (20658352).

Almost surely, 2^81838753 is an apocalyptic number.

It is an amenable number.

81838753 is a deficient number, since it is larger than the sum of its proper divisors (794655).

81838753 is a wasteful number, since it uses less digits than its factorization.

81838753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794654.

The product of its digits is 161280, while the sum is 43.

The square root of 81838753 is about 9046.4773807267. The cubic root of 81838753 is about 434.1631915477.

The spelling of 81838753 in words is "eighty-one million, eight hundred thirty-eight thousand, seven hundred fifty-three".