142513521 has 4 divisors (see below), whose sum is σ = 190018032. Its totient is φ = 95009012.

The previous prime is 142513493. The next prime is 142513523. The reversal of 142513521 is 125315241.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142513521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 142513491 and 142513500.

It is not an unprimeable number, because it can be changed into a prime (142513523) 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, 23752251 + ... + 23752256.

It is an arithmetic number, because the mean of its divisors is an integer number (47504508).

Almost surely, 2^142513521 is an apocalyptic number.

It is an amenable number.

142513521 is a deficient number, since it is larger than the sum of its proper divisors (47504511).

142513521 is an equidigital number, since it uses as much as digits as its factorization.

142513521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47504510.

The product of its digits is 1200, while the sum is 24.

The square root of 142513521 is about 11937.9027052494. The cubic root of 142513521 is about 522.3384829244.

Adding to 142513521 its reverse (125315241), we get a palindrome (267828762).

The spelling of 142513521 in words is "one hundred forty-two million, five hundred thirteen thousand, five hundred twenty-one".