120142191 has 8 divisors (see below), whose sum is σ = 172511920. Its totient is φ = 73933632.

The previous prime is 120142147. The next prime is 120142201. The reversal of 120142191 is 191241021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 120142191 - 2⁷ = 120142063 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 (120142291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1540246 + ... + 1540323.

It is an arithmetic number, because the mean of its divisors is an integer number (21563990).

Almost surely, 2^120142191 is an apocalyptic number.

120142191 is a deficient number, since it is larger than the sum of its proper divisors (52369729).

120142191 is a wasteful number, since it uses less digits than its factorization.

120142191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080585.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 120142191 is about 10960.9393301852. The cubic root of 120142191 is about 493.4371563911.

It can be divided in two parts, 120 and 142191, that added together give a triangular number (142311 = T₅₃₃).

The spelling of 120142191 in words is "one hundred twenty million, one hundred forty-two thousand, one hundred ninety-one".