123228409 has 2 divisors, whose sum is σ = 123228410. Its totient is φ = 123228408.

The previous prime is 123228401. The next prime is 123228451. The reversal of 123228409 is 904822321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63552784 + 59675625 = 7972^2 + 7725^2 .

It is a cyclic number.

It is not a de Polignac number, because 123228409 - 2³ = 123228401 is a prime.

It is not a weakly prime, because it can be changed into another prime (123228401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61614204 + 61614205.

It is an arithmetic number, because the mean of its divisors is an integer number (61614205).

Almost surely, 2^123228409 is an apocalyptic number.

It is an amenable number.

123228409 is a deficient number, since it is larger than the sum of its proper divisors (1).

123228409 is an equidigital number, since it uses as much as digits as its factorization.

123228409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 123228409 is about 11100.8292032622. The cubic root of 123228409 is about 497.6266307285.

The spelling of 123228409 in words is "one hundred twenty-three million, two hundred twenty-eight thousand, four hundred nine".