100142642 has 4 divisors (see below), whose sum is σ = 150213966. Its totient is φ = 50071320.

The previous prime is 100142593. The next prime is 100142659. The reversal of 100142642 is 246241001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246241001 = 29 ⋅8491069.

It can be written as a sum of positive squares in only one way, i.e., 84070561 + 16072081 = 9169^2 + 4009^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 25035659 + ... + 25035662.

Almost surely, 2^100142642 is an apocalyptic number.

100142642 is a deficient number, since it is larger than the sum of its proper divisors (50071324).

100142642 is an equidigital number, since it uses as much as digits as its factorization.

100142642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50071323.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 100142642 is about 10007.1295584698. The cubic root of 100142642 is about 464.3794736812.

Adding to 100142642 its reverse (246241001), we get a palindrome (346383643).

The spelling of 100142642 in words is "one hundred million, one hundred forty-two thousand, six hundred forty-two".