68981 has 4 divisors (see below), whose sum is σ = 75264. Its totient is φ = 62700.

The previous prime is 68963. The next prime is 68993. The reversal of 68981 is 18986.

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 68981 - 2⁶ = 68917 is a prime.

It is a super-2 number, since 2×68981² = 9516756722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 9 and base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 68981.

It is not an unprimeable number, because it can be changed into a prime (68281) 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, 3125 + ... + 3146.

It is an arithmetic number, because the mean of its divisors is an integer number (18816).

2⁶⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

68981 is a deficient number, since it is larger than the sum of its proper divisors (6283).

68981 is a wasteful number, since it uses less digits than its factorization.

68981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6282.

The product of its digits is 3456, while the sum is 32.

The square root of 68981 is about 262.6423423593. The cubic root of 68981 is about 41.0118942291.

The spelling of 68981 in words is "sixty-eight thousand, nine hundred eighty-one".