623505313 has 2 divisors, whose sum is σ = 623505314. Its totient is φ = 623505312.

The previous prime is 623505299. The next prime is 623505329. The reversal of 623505313 is 313505326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574896529 + 48608784 = 23977^2 + 6972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623505313 is a prime.

It is not a weakly prime, because it can be changed into another prime (623505343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311752656 + 311752657.

It is an arithmetic number, because the mean of its divisors is an integer number (311752657).

Almost surely, 2^623505313 is an apocalyptic number.

It is an amenable number.

623505313 is a deficient number, since it is larger than the sum of its proper divisors (1).

623505313 is an equidigital number, since it uses as much as digits as its factorization.

623505313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 28.

The square root of 623505313 is about 24970.0883658829. The cubic root of 623505313 is about 854.3058616077.

The spelling of 623505313 in words is "six hundred twenty-three million, five hundred five thousand, three hundred thirteen".