142443091 has 4 divisors (see below), whose sum is σ = 162792112. Its totient is φ = 122094072.

The previous prime is 142443013. The next prime is 142443097. The reversal of 142443091 is 190344241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190344241 = 2797 ⋅68053.

It is a cyclic number.

It is not a de Polignac number, because 142443091 - 2²¹ = 140345939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142443097) 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 3 ways as a sum of consecutive naturals, for example, 10174500 + ... + 10174513.

It is an arithmetic number, because the mean of its divisors is an integer number (40698028).

Almost surely, 2^142443091 is an apocalyptic number.

142443091 is a deficient number, since it is larger than the sum of its proper divisors (20349021).

142443091 is an equidigital number, since it uses as much as digits as its factorization.

142443091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20349020.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 142443091 is about 11934.9524925741. The cubic root of 142443091 is about 522.2524224089.

The spelling of 142443091 in words is "one hundred forty-two million, four hundred forty-three thousand, ninety-one".