623042209 has 2 divisors, whose sum is σ = 623042210. Its totient is φ = 623042208.

The previous prime is 623042201. The next prime is 623042263. The reversal of 623042209 is 902240326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412211809 + 210830400 = 20303^2 + 14520^2 .

It is a cyclic number.

It is not a de Polignac number, because 623042209 - 2³ = 623042201 is a prime.

It is equal to p_32463523 and since 623042209 and 32463523 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (623042201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311521104 + 311521105.

It is an arithmetic number, because the mean of its divisors is an integer number (311521105).

Almost surely, 2^623042209 is an apocalyptic number.

It is an amenable number.

623042209 is a deficient number, since it is larger than the sum of its proper divisors (1).

623042209 is an equidigital number, since it uses as much as digits as its factorization.

623042209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 623042209 is about 24960.8134683147. The cubic root of 623042209 is about 854.0942994152.

The spelling of 623042209 in words is "six hundred twenty-three million, forty-two thousand, two hundred nine".