123189853 has 2 divisors, whose sum is σ = 123189854. Its totient is φ = 123189852.

The previous prime is 123189851. The next prime is 123189881. The reversal of 123189853 is 358981321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64850809 + 58339044 = 8053^2 + 7638^2 .

It is a cyclic number.

It is not a de Polignac number, because 123189853 - 2¹ = 123189851 is a prime.

Together with 123189851, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123189851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61594926 + 61594927.

It is an arithmetic number, because the mean of its divisors is an integer number (61594927).

Almost surely, 2^123189853 is an apocalyptic number.

It is an amenable number.

123189853 is a deficient number, since it is larger than the sum of its proper divisors (1).

123189853 is an equidigital number, since it uses as much as digits as its factorization.

123189853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 123189853 is about 11099.0924403755. The cubic root of 123189853 is about 497.5747257770.

The spelling of 123189853 in words is "one hundred twenty-three million, one hundred eighty-nine thousand, eight hundred fifty-three".