100823155 has 4 divisors (see below), whose sum is σ = 120987792. Its totient is φ = 80658520.

The previous prime is 100823137. The next prime is 100823167. The reversal of 100823155 is 551328001.

It is a happy number.

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

It is not a de Polignac number, because 100823155 - 2¹³ = 100814963 is a prime.

It is a super-4 number, since 4×100823155⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

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, 10082311 + ... + 10082320.

It is an arithmetic number, because the mean of its divisors is an integer number (30246948).

Almost surely, 2^100823155 is an apocalyptic number.

100823155 is a deficient number, since it is larger than the sum of its proper divisors (20164637).

100823155 is an equidigital number, since it uses as much as digits as its factorization.

100823155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20164636.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 100823155 is about 10041.0733987956. The cubic root of 100823155 is about 465.4289870880.

The spelling of 100823155 in words is "one hundred million, eight hundred twenty-three thousand, one hundred fifty-five".