140543681 has 2 divisors, whose sum is σ = 140543682. Its totient is φ = 140543680.

The previous prime is 140543671. The next prime is 140543701. The reversal of 140543681 is 186345041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77880625 + 62663056 = 8825^2 + 7916^2 .

It is a cyclic number.

It is not a de Polignac number, because 140543681 - 2⁶ = 140543617 is a prime.

It is a super-2 number, since 2×140543681² = 39505052538059522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (140543671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70271840 + 70271841.

It is an arithmetic number, because the mean of its divisors is an integer number (70271841).

Almost surely, 2^140543681 is an apocalyptic number.

It is an amenable number.

140543681 is a deficient number, since it is larger than the sum of its proper divisors (1).

140543681 is an equidigital number, since it uses as much as digits as its factorization.

140543681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 140543681 is about 11855.1120197154. The cubic root of 140543681 is about 519.9206991990.

The spelling of 140543681 in words is "one hundred forty million, five hundred forty-three thousand, six hundred eighty-one".