142391197 has 4 divisors (see below), whose sum is σ = 153344380. Its totient is φ = 131438016.

The previous prime is 142391083. The next prime is 142391203. The reversal of 142391197 is 791193241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22838841 + 119552356 = 4779^2 + 10934^2 .

It is a cyclic number.

It is not a de Polignac number, because 142391197 - 2⁷ = 142391069 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 (142397197) 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, 5476572 + ... + 5476597.

It is an arithmetic number, because the mean of its divisors is an integer number (38336095).

Almost surely, 2^142391197 is an apocalyptic number.

It is an amenable number.

142391197 is a deficient number, since it is larger than the sum of its proper divisors (10953183).

142391197 is a wasteful number, since it uses less digits than its factorization.

142391197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10953182.

The product of its digits is 13608, while the sum is 37.

The square root of 142391197 is about 11932.7782599024. The cubic root of 142391197 is about 522.1889934309.

The spelling of 142391197 in words is "one hundred forty-two million, three hundred ninety-one thousand, one hundred ninety-seven".