100243555 has 4 divisors (see below), whose sum is σ = 120292272. Its totient is φ = 80194840.

The previous prime is 100243547. The next prime is 100243567. The reversal of 100243555 is 555342001.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 100243555 - 2³ = 100243547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10024351 + ... + 10024360.

It is an arithmetic number, because the mean of its divisors is an integer number (30073068).

Almost surely, 2^100243555 is an apocalyptic number.

100243555 is a deficient number, since it is larger than the sum of its proper divisors (20048717).

100243555 is an equidigital number, since it uses as much as digits as its factorization.

100243555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20048716.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 100243555 is about 10012.1703441362. The cubic root of 100243555 is about 464.5354052367.

Adding to 100243555 its reverse (555342001), we get a palindrome (655585556).

The spelling of 100243555 in words is "one hundred million, two hundred forty-three thousand, five hundred fifty-five".