123403121 has 2 divisors, whose sum is σ = 123403122. Its totient is φ = 123403120.

The previous prime is 123403097. The next prime is 123403123. The reversal of 123403121 is 121304321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122323600 + 1079521 = 11060^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 123403121 - 2¹⁸ = 123140977 is a prime.

Together with 123403123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123403121.

It is not a weakly prime, because it can be changed into another prime (123403123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61701560 + 61701561.

It is an arithmetic number, because the mean of its divisors is an integer number (61701561).

Almost surely, 2^123403121 is an apocalyptic number.

It is an amenable number.

123403121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123403121 is an equidigital number, since it uses as much as digits as its factorization.

123403121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 123403121 is about 11108.6957380243. The cubic root of 123403121 is about 497.8616963511.

Adding to 123403121 its reverse (121304321), we get a palindrome (244707442).

The spelling of 123403121 in words is "one hundred twenty-three million, four hundred three thousand, one hundred twenty-one".