142231517 has 4 divisors (see below), whose sum is σ = 148415520. Its totient is φ = 136047516.

The previous prime is 142231493. The next prime is 142231561. The reversal of 142231517 is 715132241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 715132241 = 19 ⋅37638539.

It is a cyclic number.

It is not a de Polignac number, because 142231517 - 2⁸ = 142231261 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 (142231577) 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, 3091967 + ... + 3092012.

It is an arithmetic number, because the mean of its divisors is an integer number (37103880).

Almost surely, 2^142231517 is an apocalyptic number.

It is an amenable number.

142231517 is a deficient number, since it is larger than the sum of its proper divisors (6184003).

142231517 is an equidigital number, since it uses as much as digits as its factorization.

142231517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6184002.

The product of its digits is 1680, while the sum is 26.

The square root of 142231517 is about 11926.0855690373. The cubic root of 142231517 is about 521.9937231034.

Adding to 142231517 its reverse (715132241), we get a palindrome (857363758).

The spelling of 142231517 in words is "one hundred forty-two million, two hundred thirty-one thousand, five hundred seventeen".