69681 has 4 divisors (see below), whose sum is σ = 92912. Its totient is φ = 46452.

The previous prime is 69677. The next prime is 69691. The reversal of 69681 is 18696.

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 not a de Polignac number, because 69681 - 2² = 69677 is a prime.

It is a super-2 number, since 2×69681² = 9710883522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

69681 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 69681.

It is not an unprimeable number, because it can be changed into a prime (69661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11611 + ... + 11616.

It is an arithmetic number, because the mean of its divisors is an integer number (23228).

2⁶⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

69681 is a deficient number, since it is larger than the sum of its proper divisors (23231).

69681 is a wasteful number, since it uses less digits than its factorization.

69681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23230.

The product of its digits is 2592, while the sum is 30.

The square root of 69681 is about 263.9715893804. The cubic root of 69681 is about 41.1501533715.

It can be divided in two parts, 696 and 81, that added together give a palindrome (777).

The spelling of 69681 in words is "sixty-nine thousand, six hundred eighty-one".