123155113 has 2 divisors, whose sum is σ = 123155114. Its totient is φ = 123155112.

The previous prime is 123155111. The next prime is 123155119. The reversal of 123155113 is 311551321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95413824 + 27741289 = 9768^2 + 5267^2 .

It is a cyclic number.

It is not a de Polignac number, because 123155113 - 2¹ = 123155111 is a prime.

Together with 123155111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123155111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61577556 + 61577557.

It is an arithmetic number, because the mean of its divisors is an integer number (61577557).

Almost surely, 2^123155113 is an apocalyptic number.

It is an amenable number.

123155113 is a deficient number, since it is larger than the sum of its proper divisors (1).

123155113 is an equidigital number, since it uses as much as digits as its factorization.

123155113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 450, while the sum is 22.

The square root of 123155113 is about 11097.5273372044. The cubic root of 123155113 is about 497.5279487341.

It can be divided in two parts, 123 and 155113, that added together give a square (155236 = 394²).

The spelling of 123155113 in words is "one hundred twenty-three million, one hundred fifty-five thousand, one hundred thirteen".