142321523 has 4 divisors (see below), whose sum is σ = 142405848. Its totient is φ = 142237200.

The previous prime is 142321513. The next prime is 142321547. The reversal of 142321523 is 325123241.

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

It is a cyclic number.

It is not a de Polignac number, because 142321523 - 2¹⁰ = 142320499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142321513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39578 + ... + 43023.

It is an arithmetic number, because the mean of its divisors is an integer number (35601462).

Almost surely, 2^142321523 is an apocalyptic number.

142321523 is a deficient number, since it is larger than the sum of its proper divisors (84325).

142321523 is an equidigital number, since it uses as much as digits as its factorization.

142321523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84324.

The product of its digits is 1440, while the sum is 23.

The square root of 142321523 is about 11929.8584652124. The cubic root of 142321523 is about 522.1038080811.

Adding to 142321523 its reverse (325123241), we get a palindrome (467444764).

The spelling of 142321523 in words is "one hundred forty-two million, three hundred twenty-one thousand, five hundred twenty-three".