142001001 has 6 divisors (see below), whose sum is σ = 205112570. Its totient is φ = 94667328.

The previous prime is 142000997. The next prime is 142001021. The reversal of 142001001 is 100100241.

It is a happy number.

142001001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 127712601 + 14288400 = 11301^2 + 3780^2 .

It is not a de Polignac number, because 142001001 - 2² = 142000997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 15777889 = 142001001 / (1 + 4 + 2 + 0 + 0 + 1 + 0 + 0 + 1).

It is a Duffinian number.

142001001 is a modest number, since divided by 1001 gives 142 as remainder.

It is not an unprimeable number, because it can be changed into a prime (142001021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7888936 + ... + 7888953.

Almost surely, 2^142001001 is an apocalyptic number.

It is an amenable number.

142001001 is a deficient number, since it is larger than the sum of its proper divisors (63111569).

142001001 is a wasteful number, since it uses less digits than its factorization.

142001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15777895 (or 15777892 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 142001001 is about 11916.4172887659. The cubic root of 142001001 is about 521.7115705216.

Adding to 142001001 its reverse (100100241), we get a palindrome (242101242).

The spelling of 142001001 in words is "one hundred forty-two million, one thousand, one".