142123001 has 4 divisors (see below), whose sum is σ = 142470900. Its totient is φ = 141775104.

The previous prime is 142122991. The next prime is 142123039. The reversal of 142123001 is 100321241.

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 55651600 + 86471401 = 7460^2 + 9299^2 .

It is a cyclic number.

It is not a de Polignac number, because 142123001 - 2¹⁰ = 142121977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142123081) 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, 173336 + ... + 174153.

It is an arithmetic number, because the mean of its divisors is an integer number (35617725).

Almost surely, 2^142123001 is an apocalyptic number.

It is an amenable number.

142123001 is a deficient number, since it is larger than the sum of its proper divisors (347899).

142123001 is an equidigital number, since it uses as much as digits as its factorization.

142123001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347898.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 142123001 is about 11921.5351779878. The cubic root of 142123001 is about 521.8609370564.

Adding to 142123001 its reverse (100321241), we get a palindrome (242444242).

The spelling of 142123001 in words is "one hundred forty-two million, one hundred twenty-three thousand, one".