100155203 has 4 divisors (see below), whose sum is σ = 103386048. Its totient is φ = 96924360.

The previous prime is 100155191. The next prime is 100155221. The reversal of 100155203 is 302551001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 302551001 = 211 ⋅1433891.

It is a cyclic number.

It is not a de Polignac number, because 100155203 - 2²⁰ = 99106627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100155233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1615376 + ... + 1615437.

It is an arithmetic number, because the mean of its divisors is an integer number (25846512).

Almost surely, 2^100155203 is an apocalyptic number.

100155203 is a deficient number, since it is larger than the sum of its proper divisors (3230845).

100155203 is an equidigital number, since it uses as much as digits as its factorization.

100155203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3230844.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 100155203 is about 10007.7571413379. The cubic root of 100155203 is about 464.3988887428.

The spelling of 100155203 in words is "one hundred million, one hundred fifty-five thousand, two hundred three".