102312209 has 2 divisors, whose sum is σ = 102312210. Its totient is φ = 102312208.

The previous prime is 102312193. The next prime is 102312227. The reversal of 102312209 is 902213201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70140625 + 32171584 = 8375^2 + 5672^2 .

It is a cyclic number.

It is not a de Polignac number, because 102312209 - 2⁴ = 102312193 is a prime.

It is a super-2 number, since 2×102312209² = 20935576220919362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (102314209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51156104 + 51156105.

It is an arithmetic number, because the mean of its divisors is an integer number (51156105).

Almost surely, 2^102312209 is an apocalyptic number.

It is an amenable number.

102312209 is a deficient number, since it is larger than the sum of its proper divisors (1).

102312209 is an equidigital number, since it uses as much as digits as its factorization.

102312209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 102312209 is about 10114.9497774334. The cubic root of 102312209 is about 467.7091006994.

The spelling of 102312209 in words is "one hundred two million, three hundred twelve thousand, two hundred nine".