142305517 has 4 divisors (see below), whose sum is σ = 142506940. Its totient is φ = 142104096.

The previous prime is 142305491. The next prime is 142305539. The reversal of 142305517 is 715503241.

It is a happy number.

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 96255721 + 46049796 = 9811^2 + 6786^2 .

It is a cyclic number.

It is not a de Polignac number, because 142305517 - 2¹⁵ = 142272749 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 (142305557) 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, 99648 + ... + 101065.

It is an arithmetic number, because the mean of its divisors is an integer number (35626735).

Almost surely, 2^142305517 is an apocalyptic number.

It is an amenable number.

142305517 is a deficient number, since it is larger than the sum of its proper divisors (201423).

142305517 is an equidigital number, since it uses as much as digits as its factorization.

142305517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201422.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 142305517 is about 11929.1876085507. The cubic root of 142305517 is about 522.0842347781.

Adding to 142305517 its reverse (715503241), we get a palindrome (857808758).

The spelling of 142305517 in words is "one hundred forty-two million, three hundred five thousand, five hundred seventeen".