123253309 has 2 divisors, whose sum is σ = 123253310. Its totient is φ = 123253308.

The previous prime is 123253307. The next prime is 123253313. The reversal of 123253309 is 903352321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109725625 + 13527684 = 10475^2 + 3678^2 .

It is a cyclic number.

It is not a de Polignac number, because 123253309 - 2¹ = 123253307 is a prime.

Together with 123253307, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123253307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61626654 + 61626655.

It is an arithmetic number, because the mean of its divisors is an integer number (61626655).

Almost surely, 2^123253309 is an apocalyptic number.

It is an amenable number.

123253309 is a deficient number, since it is larger than the sum of its proper divisors (1).

123253309 is an equidigital number, since it uses as much as digits as its factorization.

123253309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 123253309 is about 11101.9506844518. The cubic root of 123253309 is about 497.6601459130.

The spelling of 123253309 in words is "one hundred twenty-three million, two hundred fifty-three thousand, three hundred nine".