623524009 has 2 divisors, whose sum is σ = 623524010. Its totient is φ = 623524008.

The previous prime is 623523991. The next prime is 623524073. The reversal of 623524009 is 900425326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518563984 + 104960025 = 22772^2 + 10245^2 .

It is a cyclic number.

It is not a de Polignac number, because 623524009 - 2⁷ = 623523881 is a prime.

It is not a weakly prime, because it can be changed into another prime (623524309) 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, 311762004 + 311762005.

It is an arithmetic number, because the mean of its divisors is an integer number (311762005).

Almost surely, 2^623524009 is an apocalyptic number.

It is an amenable number.

623524009 is a deficient number, since it is larger than the sum of its proper divisors (1).

623524009 is an equidigital number, since it uses as much as digits as its factorization.

623524009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 623524009 is about 24970.4627309948. The cubic root of 623524009 is about 854.3144003977.

The spelling of 623524009 in words is "six hundred twenty-three million, five hundred twenty-four thousand, nine".