623009909 has 2 divisors, whose sum is σ = 623009910. Its totient is φ = 623009908.

The previous prime is 623009903. The next prime is 623009921. The reversal of 623009909 is 909900326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602849809 + 20160100 = 24553^2 + 4490^2 .

It is a cyclic number.

It is not a de Polignac number, because 623009909 - 2²⁸ = 354574453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623009903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311504954 + 311504955.

It is an arithmetic number, because the mean of its divisors is an integer number (311504955).

Almost surely, 2^623009909 is an apocalyptic number.

It is an amenable number.

623009909 is a deficient number, since it is larger than the sum of its proper divisors (1).

623009909 is an equidigital number, since it uses as much as digits as its factorization.

623009909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 623009909 is about 24960.1664457591. The cubic root of 623009909 is about 854.0795397289.

The spelling of 623009909 in words is "six hundred twenty-three million, nine thousand, nine hundred nine".