140138681 has 2 divisors, whose sum is σ = 140138682. Its totient is φ = 140138680.

The previous prime is 140138639. The next prime is 140138717. The reversal of 140138681 is 186831041.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97693456 + 42445225 = 9884^2 + 6515^2 .

It is a cyclic number.

It is not a de Polignac number, because 140138681 - 2²² = 135944377 is a prime.

It is a super-2 number, since 2×140138681² = 39277699824839522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140138381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70069340 + 70069341.

It is an arithmetic number, because the mean of its divisors is an integer number (70069341).

Almost surely, 2^140138681 is an apocalyptic number.

It is an amenable number.

140138681 is a deficient number, since it is larger than the sum of its proper divisors (1).

140138681 is an equidigital number, since it uses as much as digits as its factorization.

140138681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 140138681 is about 11838.0184574953. The cubic root of 140138681 is about 519.4208060502.

The spelling of 140138681 in words is "one hundred forty million, one hundred thirty-eight thousand, six hundred eighty-one".