140431547 has 4 divisors (see below), whose sum is σ = 140539176. Its totient is φ = 140323920.

The previous prime is 140431517. The next prime is 140431549. The reversal of 140431547 is 745134041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745134041 = 41 ⋅18174001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140431547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140431549) 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, 51833 + ... + 54474.

It is an arithmetic number, because the mean of its divisors is an integer number (35134794).

Almost surely, 2^140431547 is an apocalyptic number.

140431547 is a deficient number, since it is larger than the sum of its proper divisors (107629).

140431547 is a wasteful number, since it uses less digits than its factorization.

140431547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107628.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 140431547 is about 11850.3817238096. The cubic root of 140431547 is about 519.7823879888.

Adding to 140431547 its reverse (745134041), we get a palindrome (885565588).

The spelling of 140431547 in words is "one hundred forty million, four hundred thirty-one thousand, five hundred forty-seven".