123100005 has 24 divisors (see below), whose sum is σ = 229118112. Its totient is φ = 56273952.

The previous prime is 123099997. The next prime is 123100051. The reversal of 123100005 is 500001321.

It is not a de Polignac number, because 123100005 - 2³ = 123099997 is a prime.

It is a super-2 number, since 2×123100005² = 30307222462000050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83007 + ... + 84476.

It is an arithmetic number, because the mean of its divisors is an integer number (9546588).

Almost surely, 2^123100005 is an apocalyptic number.

123100005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123100005 is a deficient number, since it is larger than the sum of its proper divisors (106018107).

123100005 is a wasteful number, since it uses less digits than its factorization.

123100005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167505 (or 167498 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 123100005 is about 11095.0441639500. The cubic root of 123100005 is about 497.4537283463.

Adding to 123100005 its reverse (500001321), we get a palindrome (623101326).

It can be divided in two parts, 123 and 100005, that added together give a triangular number (100128 = T₄₄₇).

The spelling of 123100005 in words is "one hundred twenty-three million, one hundred thousand, five".