123505997 has 2 divisors, whose sum is σ = 123505998. Its totient is φ = 123505996.

The previous prime is 123505979. The next prime is 123506017. The reversal of 123505997 is 799505321.

Together with previous prime (123505979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102839881 + 20666116 = 10141^2 + 4546^2 .

It is a cyclic number.

It is not a de Polignac number, because 123505997 - 2¹⁶ = 123440461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123505937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61752998 + 61752999.

It is an arithmetic number, because the mean of its divisors is an integer number (61752999).

Almost surely, 2^123505997 is an apocalyptic number.

It is an amenable number.

123505997 is a deficient number, since it is larger than the sum of its proper divisors (1).

123505997 is an equidigital number, since it uses as much as digits as its factorization.

123505997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 85050, while the sum is 41.

The square root of 123505997 is about 11113.3251999570. The cubic root of 123505997 is about 498.0000067203. Note that the first 5 decimals are identical.

The spelling of 123505997 in words is "one hundred twenty-three million, five hundred five thousand, nine hundred ninety-seven".