623116309 has 2 divisors, whose sum is σ = 623116310. Its totient is φ = 623116308.

The previous prime is 623116279. The next prime is 623116313. The reversal of 623116309 is 903611326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 406143409 + 216972900 = 20153^2 + 14730^2 .

It is a cyclic number.

It is not a de Polignac number, because 623116309 - 2⁹ = 623115797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623116009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311558154 + 311558155.

It is an arithmetic number, because the mean of its divisors is an integer number (311558155).

Almost surely, 2^623116309 is an apocalyptic number.

It is an amenable number.

623116309 is a deficient number, since it is larger than the sum of its proper divisors (1).

623116309 is an equidigital number, since it uses as much as digits as its factorization.

623116309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 623116309 is about 24962.2977508081. The cubic root of 623116309 is about 854.1281579445.

The spelling of 623116309 in words is "six hundred twenty-three million, one hundred sixteen thousand, three hundred nine".