100031123 has 4 divisors (see below), whose sum is σ = 100138368. Its totient is φ = 99923880.

The previous prime is 100031101. The next prime is 100031159. The reversal of 100031123 is 321130001.

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

It is a cyclic number.

It is not a de Polignac number, because 100031123 - 2⁶ = 100031059 is a prime.

It is a super-2 number, since 2×100031123² = 20012451137282258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100030123) 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, 52211 + ... + 54092.

It is an arithmetic number, because the mean of its divisors is an integer number (25034592).

Almost surely, 2^100031123 is an apocalyptic number.

100031123 is a deficient number, since it is larger than the sum of its proper divisors (107245).

100031123 is an equidigital number, since it uses as much as digits as its factorization.

100031123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107244.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 100031123 is about 10001.5560289387. The cubic root of 100031123 is about 464.2070317563.

Adding to 100031123 its reverse (321130001), we get a palindrome (421161124).

It can be divided in two parts, 1000 and 31123, that added together give a palindrome (32123).

The spelling of 100031123 in words is "one hundred million, thirty-one thousand, one hundred twenty-three".