623201309 has 2 divisors, whose sum is σ = 623201310. Its totient is φ = 623201308.

The previous prime is 623201269. The next prime is 623201321. The reversal of 623201309 is 903102326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607622500 + 15578809 = 24650^2 + 3947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623201309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623201389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311600654 + 311600655.

It is an arithmetic number, because the mean of its divisors is an integer number (311600655).

Almost surely, 2^623201309 is an apocalyptic number.

It is an amenable number.

623201309 is a deficient number, since it is larger than the sum of its proper divisors (1).

623201309 is an equidigital number, since it uses as much as digits as its factorization.

623201309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 623201309 is about 24964.0002603749. Note that the first 3 decimals coincide. The cubic root of 623201309 is about 854.1669937079.

The spelling of 623201309 in words is "six hundred twenty-three million, two hundred one thousand, three hundred nine".