107981 has 2 divisors, whose sum is σ = 107982. Its totient is φ = 107980.

The previous prime is 107971. The next prime is 107999. The reversal of 107981 is 189701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96100 + 11881 = 310^2 + 109^2 .

It is an emirp because it is prime and its reverse (189701) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 107981 - 2¹⁰ = 106957 is a prime.

It is a super-2 number, since 2×107981² = 23319792722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 107981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (107941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53990 + 53991.

It is an arithmetic number, because the mean of its divisors is an integer number (53991).

2¹⁰⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

107981 is a deficient number, since it is larger than the sum of its proper divisors (1).

107981 is an equidigital number, since it uses as much as digits as its factorization.

107981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 107981 is about 328.6046256522. The cubic root of 107981 is about 47.6192387453.

The spelling of 107981 in words is "one hundred seven thousand, nine hundred eighty-one".