123031309 has 4 divisors (see below), whose sum is σ = 123085116. Its totient is φ = 122977504.

The previous prime is 123031303. The next prime is 123031331. The reversal of 123031309 is 903130321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17455684 + 105575625 = 4178^2 + 10275^2 .

It is a cyclic number.

It is not a de Polignac number, because 123031309 - 2⁵ = 123031277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123031309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123031303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23314 + ... + 28099.

It is an arithmetic number, because the mean of its divisors is an integer number (30771279).

Almost surely, 2^123031309 is an apocalyptic number.

It is an amenable number.

123031309 is a deficient number, since it is larger than the sum of its proper divisors (53807).

123031309 is an equidigital number, since it uses as much as digits as its factorization.

123031309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53806.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 123031309 is about 11091.9479353268. The cubic root of 123031309 is about 497.3611763868.

The spelling of 123031309 in words is "one hundred twenty-three million, thirty-one thousand, three hundred nine".