140443531 has 4 divisors (see below), whose sum is σ = 140687512. Its totient is φ = 140199552.

The previous prime is 140443517. The next prime is 140443577. The reversal of 140443531 is 135344041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135344041 = 7 ⋅19334863.

It is a cyclic number.

It is not a de Polignac number, because 140443531 - 2⁷ = 140443403 is a prime.

It is a super-2 number, since 2×140443531² = 39448770799495922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140443496 and 140443505.

It is not an unprimeable number, because it can be changed into a prime (140443931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121125 + ... + 122278.

It is an arithmetic number, because the mean of its divisors is an integer number (35171878).

Almost surely, 2^140443531 is an apocalyptic number.

140443531 is a deficient number, since it is larger than the sum of its proper divisors (243981).

140443531 is an equidigital number, since it uses as much as digits as its factorization.

140443531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243980.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 140443531 is about 11850.8873507430. The cubic root of 140443531 is about 519.7971731163.

Adding to 140443531 its reverse (135344041), we get a palindrome (275787572).

The spelling of 140443531 in words is "one hundred forty million, four hundred forty-three thousand, five hundred thirty-one".