100855043 has 4 divisors (see below), whose sum is σ = 102070248. Its totient is φ = 99639840.

The previous prime is 100855031. The next prime is 100855049. The reversal of 100855043 is 340558001.

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

It is not a de Polignac number, because 100855043 - 2⁶ = 100854979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100855049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607478 + ... + 607643.

It is an arithmetic number, because the mean of its divisors is an integer number (25517562).

Almost surely, 2^100855043 is an apocalyptic number.

100855043 is a deficient number, since it is larger than the sum of its proper divisors (1215205).

100855043 is an equidigital number, since it uses as much as digits as its factorization.

100855043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215204.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 100855043 is about 10042.6611513085. The cubic root of 100855043 is about 465.4780500079.

It can be divided in two parts, 10085 and 5043, that multiplied together give a triangular number (50858655 = T₁₀₀₈₅).

The spelling of 100855043 in words is "one hundred million, eight hundred fifty-five thousand, forty-three".