100242155 has 8 divisors (see below), whose sum is σ = 129543792. Its totient is φ = 74024928.

The previous prime is 100242143. The next prime is 100242161. The reversal of 100242155 is 551242001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100242155 - 2¹² = 100238059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 771029 + ... + 771158.

It is an arithmetic number, because the mean of its divisors is an integer number (16192974).

Almost surely, 2^100242155 is an apocalyptic number.

100242155 is a deficient number, since it is larger than the sum of its proper divisors (29301637).

100242155 is a wasteful number, since it uses less digits than its factorization.

100242155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542205.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 100242155 is about 10012.1004289809. The cubic root of 100242155 is about 464.5332426618.

Adding to 100242155 its reverse (551242001), we get a palindrome (651484156).

It can be divided in two parts, 1002421 and 55, that multiplied together give a palindrome (55133155).

The spelling of 100242155 in words is "one hundred million, two hundred forty-two thousand, one hundred fifty-five".