623635109 has 2 divisors, whose sum is σ = 623635110. Its totient is φ = 623635108.

The previous prime is 623635093. The next prime is 623635139. The reversal of 623635109 is 901536326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 557668225 + 65966884 = 23615^2 + 8122^2 .

It is a cyclic number.

It is not a de Polignac number, because 623635109 - 2⁴ = 623635093 is a prime.

It is equal to p_32492852 and since 623635109 and 32492852 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623635139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311817554 + 311817555.

It is an arithmetic number, because the mean of its divisors is an integer number (311817555).

Almost surely, 2^623635109 is an apocalyptic number.

It is an amenable number.

623635109 is a deficient number, since it is larger than the sum of its proper divisors (1).

623635109 is an equidigital number, since it uses as much as digits as its factorization.

623635109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 623635109 is about 24972.6872602850. The cubic root of 623635109 is about 854.3651381890.

The spelling of 623635109 in words is "six hundred twenty-three million, six hundred thirty-five thousand, one hundred nine".