203020009 has 2 divisors, whose sum is σ = 203020010. Its totient is φ = 203020008.

The previous prime is 203019991. The next prime is 203020019. The reversal of 203020009 is 900020302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199515625 + 3504384 = 14125^2 + 1872^2 .

It is a cyclic number.

It is not a de Polignac number, because 203020009 - 2¹³ = 203011817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203019974 and 203020001.

It is not a weakly prime, because it can be changed into another prime (203020019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101510004 + 101510005.

It is an arithmetic number, because the mean of its divisors is an integer number (101510005).

Almost surely, 2^203020009 is an apocalyptic number.

It is an amenable number.

203020009 is a deficient number, since it is larger than the sum of its proper divisors (1).

203020009 is an equidigital number, since it uses as much as digits as its factorization.

203020009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 203020009 is about 14248.5090097175. The cubic root of 203020009 is about 587.7323748938.

The spelling of 203020009 in words is "two hundred three million, twenty thousand, nine".