141231521 has 4 divisors (see below), whose sum is σ = 141255492. Its totient is φ = 141207552.

The previous prime is 141231481. The next prime is 141231533. The reversal of 141231521 is 125132141.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 120209296 + 21022225 = 10964^2 + 4585^2 .

It is a cyclic number.

It is not a de Polignac number, because 141231521 - 2⁶ = 141231457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 141231493 and 141231502.

It is not an unprimeable number, because it can be changed into a prime (141230521) 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, 3665 + ... + 17201.

It is an arithmetic number, because the mean of its divisors is an integer number (35313873).

Almost surely, 2^141231521 is an apocalyptic number.

It is an amenable number.

141231521 is a deficient number, since it is larger than the sum of its proper divisors (23971).

141231521 is a wasteful number, since it uses less digits than its factorization.

141231521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23970.

The product of its digits is 240, while the sum is 20.

The square root of 141231521 is about 11884.0868812038. The cubic root of 141231521 is about 520.7675069078.

Adding to 141231521 its reverse (125132141), we get a palindrome (266363662).

The spelling of 141231521 in words is "one hundred forty-one million, two hundred thirty-one thousand, five hundred twenty-one".