142136139 has 4 divisors (see below), whose sum is σ = 189514856. Its totient is φ = 94757424.

The previous prime is 142136119. The next prime is 142136171. The reversal of 142136139 is 931631241.

142136139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931631241 = 3 ⋅310543747.

It is not a de Polignac number, because 142136139 - 2¹² = 142132043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142136119) 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, 23689354 + ... + 23689359.

It is an arithmetic number, because the mean of its divisors is an integer number (47378714).

Almost surely, 2^142136139 is an apocalyptic number.

142136139 is a deficient number, since it is larger than the sum of its proper divisors (47378717).

142136139 is an equidigital number, since it uses as much as digits as its factorization.

142136139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47378716.

The product of its digits is 3888, while the sum is 30.

The square root of 142136139 is about 11922.0861848923. The cubic root of 142136139 is about 521.8770170192.

The spelling of 142136139 in words is "one hundred forty-two million, one hundred thirty-six thousand, one hundred thirty-nine".