81108369 has 12 divisors (see below), whose sum is σ = 120936192. Its totient is φ = 52327800.

The previous prime is 81108361. The next prime is 81108383. The reversal of 81108369 is 96380118.

It is not a de Polignac number, because 81108369 - 2³ = 81108361 is a prime.

It is a super-2 number, since 2×81108369² = 13157135043680322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81108361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145077 + ... + 145634.

It is an arithmetic number, because the mean of its divisors is an integer number (10078016).

Almost surely, 2^81108369 is an apocalyptic number.

It is an amenable number.

81108369 is a deficient number, since it is larger than the sum of its proper divisors (39827823).

81108369 is a wasteful number, since it uses less digits than its factorization.

81108369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290748 (or 290745 counting only the distinct ones).

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

The square root of 81108369 is about 9006.0184876559. The cubic root of 81108369 is about 432.8677420720.

The spelling of 81108369 in words is "eighty-one million, one hundred eight thousand, three hundred sixty-nine".