26981 has 2 divisors, whose sum is σ = 26982. Its totient is φ = 26980.

The previous prime is 26959. The next prime is 26987. The reversal of 26981 is 18962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17956 + 9025 = 134^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 26981 - 2¹⁴ = 10597 is a prime.

It is a super-2 number, since 2×26981² = 1455948722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26981.

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 26981.

It is not a weakly prime, because it can be changed into another prime (26987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13490 + 13491.

It is an arithmetic number, because the mean of its divisors is an integer number (13491).

2²⁶⁹⁸¹ is an apocalyptic number.

It is an amenable number.

26981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26981 is an equidigital number, since it uses as much as digits as its factorization.

26981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 26981 is about 164.2589419179. The cubic root of 26981 is about 29.9929613117.

The spelling of 26981 in words is "twenty-six thousand, nine hundred eighty-one".