81386469 has 24 divisors (see below), whose sum is σ = 120836352. Its totient is φ = 52760160.

The previous prime is 81386407. The next prime is 81386471. The reversal of 81386469 is 96468318.

It is not a de Polignac number, because 81386469 - 2¹¹ = 81384421 is a prime.

It is a super-3 number, since 3×81386469³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81386479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76032 + ... + 77094.

It is an arithmetic number, because the mean of its divisors is an integer number (5034848).

Almost surely, 2^81386469 is an apocalyptic number.

It is an amenable number.

81386469 is a deficient number, since it is larger than the sum of its proper divisors (39449883).

81386469 is a wasteful number, since it uses less digits than its factorization.

81386469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297 (or 1294 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 81386469 is about 9021.4449507826. Note that the first 3 decimals coincide. The cubic root of 81386469 is about 433.3619088980.

The spelling of 81386469 in words is "eighty-one million, three hundred eighty-six thousand, four hundred sixty-nine".