140521453 has 4 divisors (see below), whose sum is σ = 141464700. Its totient is φ = 139578208.

The previous prime is 140521441. The next prime is 140521471. The reversal of 140521453 is 354125041.

It is a happy number.

140521453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92121604 + 48399849 = 9598^2 + 6957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140521453 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 (140521253) 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, 471400 + ... + 471697.

It is an arithmetic number, because the mean of its divisors is an integer number (35366175).

Almost surely, 2^140521453 is an apocalyptic number.

It is an amenable number.

140521453 is a deficient number, since it is larger than the sum of its proper divisors (943247).

140521453 is an equidigital number, since it uses as much as digits as its factorization.

140521453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943246.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 140521453 is about 11854.1744967754. The cubic root of 140521453 is about 519.8932880138.

Adding to 140521453 its reverse (354125041), we get a palindrome (494646494).

The spelling of 140521453 in words is "one hundred forty million, five hundred twenty-one thousand, four hundred fifty-three".