140543549 has 4 divisors (see below), whose sum is σ = 142122780. Its totient is φ = 138964320.

The previous prime is 140543527. The next prime is 140543561. The reversal of 140543549 is 945345041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 945345041 = 8263 ⋅114407.

It can be written as a sum of positive squares in 2 ways, for example, as 87516025 + 53027524 = 9355^2 + 7282^2 .

It is a cyclic number.

It is not a de Polignac number, because 140543549 - 2²⁰ = 139494973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140545549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789482 + ... + 789659.

It is an arithmetic number, because the mean of its divisors is an integer number (35530695).

Almost surely, 2^140543549 is an apocalyptic number.

It is an amenable number.

140543549 is a deficient number, since it is larger than the sum of its proper divisors (1579231).

140543549 is an equidigital number, since it uses as much as digits as its factorization.

140543549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579230.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 140543549 is about 11855.1064524955. The cubic root of 140543549 is about 519.9205364274.

The spelling of 140543549 in words is "one hundred forty million, five hundred forty-three thousand, five hundred forty-nine".