142142191 has 4 divisors (see below), whose sum is σ = 142447032. Its totient is φ = 141837352.

The previous prime is 142142183. The next prime is 142142227. The reversal of 142142191 is 191241241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191241241 = 13829².

It is a cyclic number.

It is not a de Polignac number, because 142142191 - 2³ = 142142183 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 (142142171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151720 + ... + 152653.

It is an arithmetic number, because the mean of its divisors is an integer number (35611758).

Almost surely, 2^142142191 is an apocalyptic number.

142142191 is a deficient number, since it is larger than the sum of its proper divisors (304841).

142142191 is an equidigital number, since it uses as much as digits as its factorization.

142142191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304840.

The product of its digits is 576, while the sum is 25.

The square root of 142142191 is about 11922.3399968295. The cubic root of 142142191 is about 521.8844238967.

The spelling of 142142191 in words is "one hundred forty-two million, one hundred forty-two thousand, one hundred ninety-one".