142136391 has 16 divisors (see below), whose sum is σ = 194116608. Its totient is φ = 92484000.

The previous prime is 142136387. The next prime is 142136399. The reversal of 142136391 is 193631241.

It is not a de Polignac number, because 142136391 - 2² = 142136387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142136399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18210 + ... + 24816.

It is an arithmetic number, because the mean of its divisors is an integer number (12132288).

Almost surely, 2^142136391 is an apocalyptic number.

142136391 is a deficient number, since it is larger than the sum of its proper divisors (51980217).

142136391 is a wasteful number, since it uses less digits than its factorization.

142136391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6782.

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

The square root of 142136391 is about 11922.0967535077. The cubic root of 142136391 is about 521.8773254393.

The spelling of 142136391 in words is "one hundred forty-two million, one hundred thirty-six thousand, three hundred ninety-one".