201230209309 has 2 divisors, whose sum is σ = 201230209310. Its totient is φ = 201230209308.

The previous prime is 201230209303. The next prime is 201230209319. The reversal of 201230209309 is 903902032102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187248329284 + 13981880025 = 432722^2 + 118245^2 .

It is a cyclic number.

It is not a de Polignac number, because 201230209309 - 2⁵ = 201230209277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201230209303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100615104654 + 100615104655.

It is an arithmetic number, because the mean of its divisors is an integer number (100615104655).

Almost surely, 2^201230209309 is an apocalyptic number.

It is an amenable number.

201230209309 is a deficient number, since it is larger than the sum of its proper divisors (1).

201230209309 is an equidigital number, since it uses as much as digits as its factorization.

201230209309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The spelling of 201230209309 in words is "two hundred one billion, two hundred thirty million, two hundred nine thousand, three hundred nine".