140681 has 2 divisors, whose sum is σ = 140682. Its totient is φ = 140680.

The previous prime is 140677. The next prime is 140683. The reversal of 140681 is 186041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80656 + 60025 = 284^2 + 245^2 .

It is an emirp because it is prime and its reverse (186041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140681 - 2² = 140677 is a prime.

It is a super-2 number, since 2×140681² = 39582287522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 140683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 140681.

It is not a weakly prime, because it can be changed into another prime (140683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70340 + 70341.

It is an arithmetic number, because the mean of its divisors is an integer number (70341).

2¹⁴⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

140681 is a deficient number, since it is larger than the sum of its proper divisors (1).

140681 is an equidigital number, since it uses as much as digits as its factorization.

140681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 140681 is about 375.0746592347. The cubic root of 140681 is about 52.0089974569.

The spelling of 140681 in words is "one hundred forty thousand, six hundred eighty-one".