123130100 has 18 divisors (see below), whose sum is σ = 267192534. Its totient is φ = 49252000.

The previous prime is 123130097. The next prime is 123130129. The reversal of 123130100 is 1031321.

It can be written as a sum of positive squares in 3 ways, for example, as 1865956 + 121264144 = 1366^2 + 11012^2 .

It is a super-2 number, since 2×123130100² = 30322043052020000, 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 5 ways as a sum of consecutive naturals, for example, 615551 + ... + 615750.

Almost surely, 2^123130100 is an apocalyptic number.

123130100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123130100 is an abundant number, since it is smaller than the sum of its proper divisors (144062434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123130100 is a wasteful number, since it uses less digits than its factorization.

123130100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231315 (or 1231308 counting only the distinct ones).

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

The square root of 123130100 is about 11096.4003172200. The cubic root of 123130100 is about 497.4942635467.

Adding to 123130100 its reverse (1031321), we get a palindrome (124161421).

The spelling of 123130100 in words is "one hundred twenty-three million, one hundred thirty thousand, one hundred".