142100191 has 4 divisors (see below), whose sum is σ = 142251192. Its totient is φ = 141949192.

The previous prime is 142100149. The next prime is 142100197. The reversal of 142100191 is 191001241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191001241 = 53 ⋅3603797.

It is a cyclic number.

It is not a de Polignac number, because 142100191 - 2¹⁵ = 142067423 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 (142100197) 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, 74080 + ... + 75973.

It is an arithmetic number, because the mean of its divisors is an integer number (35562798).

Almost surely, 2^142100191 is an apocalyptic number.

142100191 is a deficient number, since it is larger than the sum of its proper divisors (151001).

142100191 is an equidigital number, since it uses as much as digits as its factorization.

142100191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151000.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 142100191 is about 11920.5784675074. The cubic root of 142100191 is about 521.8330169103.

The spelling of 142100191 in words is "one hundred forty-two million, one hundred thousand, one hundred ninety-one".