100123111131031 has 4 divisors (see below), whose sum is σ = 105392748559000. Its totient is φ = 94853473703064.

The previous prime is 100123111131019. The next prime is 100123111131041. The reversal of 100123111131031 is 130131111321001.

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 100123111131031 - 2¹¹ = 100123111128983 is a prime.

It is a super-2 number, since 2×100123111131031² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 5269637427949 = 100123111131031 / (1 + 0 + 0 + 1 + 2 + 3 + 1 + 1 + 1 + 1 + 3 + 1 + 0 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100123111131041) 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, 2634818713956 + ... + 2634818713993.

It is an arithmetic number, because the mean of its divisors is an integer number (26348187139750).

Almost surely, 2^{100123111131031} is an apocalyptic number.

100123111131031 is a deficient number, since it is larger than the sum of its proper divisors (5269637427969).

100123111131031 is an equidigital number, since it uses as much as digits as its factorization.

100123111131031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5269637427968.

The product of its (nonzero) digits is 54, while the sum is 19.

Adding to 100123111131031 its reverse (130131111321001), we get a palindrome (230254222452032).

The spelling of 100123111131031 in words is "one hundred trillion, one hundred twenty-three billion, one hundred eleven million, one hundred thirty-one thousand, thirty-one".