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BaseRepresentation
bin10000110100010001
310111111011
4100310101
54201011
61250521
7404551
oct206421
9114434
1068881
114782a
1233a41
1325477
141b161
1515621
hex10d11

68881 has 2 divisors, whose sum is σ = 68882. Its totient is φ = 68880.

The previous prime is 68879. The next prime is 68891. The reversal of 68881 is 18886.

68881 is nontrivially palindromic in base 6.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36481 + 32400 = 191^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 68881 - 21 = 68879 is a prime.

It is a super-2 number, since 2×688812 = 9489184322, which contains 22 as substring.

Together with 68879, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34440 + 34441.

It is an arithmetic number, because the mean of its divisors is an integer number (34441).

268881 is an apocalyptic number.

It is an amenable number.

68881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68881 is an equidigital number, since it uses as much as digits as its factorization.

68881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 31.

The square root of 68881 is about 262.4519003551. The cubic root of 68881 is about 40.9920666784.

It can be divided in two parts, 6888 and 1, that added together give a square (6889 = 832).

The spelling of 68881 in words is "sixty-eight thousand, eight hundred eighty-one".