123645229 has 2 divisors, whose sum is σ = 123645230. Its totient is φ = 123645228.

The previous prime is 123645227. The next prime is 123645259. The reversal of 123645229 is 922546321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118309129 + 5336100 = 10877^2 + 2310^2 .

It is a cyclic number.

It is not a de Polignac number, because 123645229 - 2¹ = 123645227 is a prime.

Together with 123645227, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 123645194 and 123645203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123645227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61822614 + 61822615.

It is an arithmetic number, because the mean of its divisors is an integer number (61822615).

Almost surely, 2^123645229 is an apocalyptic number.

It is an amenable number.

123645229 is a deficient number, since it is larger than the sum of its proper divisors (1).

123645229 is an equidigital number, since it uses as much as digits as its factorization.

123645229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 123645229 is about 11119.5876272459. The cubic root of 123645229 is about 498.1870732043.

The spelling of 123645229 in words is "one hundred twenty-three million, six hundred forty-five thousand, two hundred twenty-nine".