81769853 has 8 divisors (see below), whose sum is σ = 93082176. Its totient is φ = 71104000.

The previous prime is 81769843. The next prime is 81769861. The reversal of 81769853 is 35896718.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81769853 - 2⁴ = 81769837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81769798 and 81769807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81769843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161348 + ... + 161853.

It is an arithmetic number, because the mean of its divisors is an integer number (11635272).

Almost surely, 2^81769853 is an apocalyptic number.

It is an amenable number.

81769853 is a deficient number, since it is larger than the sum of its proper divisors (11312323).

81769853 is a wasteful number, since it uses less digits than its factorization.

81769853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323235.

The product of its digits is 362880, while the sum is 47.

The square root of 81769853 is about 9042.6684667746. The cubic root of 81769853 is about 434.0413167571.

The spelling of 81769853 in words is "eighty-one million, seven hundred sixty-nine thousand, eight hundred fifty-three".