142808129 has 4 divisors (see below), whose sum is σ = 145502676. Its totient is φ = 140113584.

The previous prime is 142808089. The next prime is 142808167. The reversal of 142808129 is 921808241.

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 126607504 + 16200625 = 11252^2 + 4025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142808129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142808629) 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, 1347194 + ... + 1347299.

It is an arithmetic number, because the mean of its divisors is an integer number (36375669).

Almost surely, 2^142808129 is an apocalyptic number.

It is an amenable number.

142808129 is a deficient number, since it is larger than the sum of its proper divisors (2694547).

142808129 is an equidigital number, since it uses as much as digits as its factorization.

142808129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694546.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 142808129 is about 11950.2355206916. The cubic root of 142808129 is about 522.6981661736.

The spelling of 142808129 in words is "one hundred forty-two million, eight hundred eight thousand, one hundred twenty-nine".