142544521 has 4 divisors (see below), whose sum is σ = 162908032. Its totient is φ = 122181012.

The previous prime is 142544509. The next prime is 142544533. The reversal of 142544521 is 125445241.

142544521 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (142544509) and next prime (142544533).

It is a cyclic number.

It is not a de Polignac number, because 142544521 - 2¹¹ = 142542473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142544521.

It is not an unprimeable number, because it can be changed into a prime (142544581) 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, 10181745 + ... + 10181758.

It is an arithmetic number, because the mean of its divisors is an integer number (40727008).

Almost surely, 2^142544521 is an apocalyptic number.

It is an amenable number.

142544521 is a deficient number, since it is larger than the sum of its proper divisors (20363511).

142544521 is an equidigital number, since it uses as much as digits as its factorization.

142544521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20363510.

The product of its digits is 6400, while the sum is 28.

The square root of 142544521 is about 11939.2010201688. The cubic root of 142544521 is about 522.3763537615.

Adding to 142544521 its reverse (125445241), we get a palindrome (267989762).

The spelling of 142544521 in words is "one hundred forty-two million, five hundred forty-four thousand, five hundred twenty-one".