212305109 has 2 divisors, whose sum is σ = 212305110. Its totient is φ = 212305108.

The previous prime is 212305103. The next prime is 212305117. The reversal of 212305109 is 901503212.

212305109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118156900 + 94148209 = 10870^2 + 9703^2 .

It is a cyclic number.

It is not a de Polignac number, because 212305109 - 2¹² = 212301013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212305103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106152554 + 106152555.

It is an arithmetic number, because the mean of its divisors is an integer number (106152555).

Almost surely, 2^212305109 is an apocalyptic number.

It is an amenable number.

212305109 is a deficient number, since it is larger than the sum of its proper divisors (1).

212305109 is an equidigital number, since it uses as much as digits as its factorization.

212305109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 212305109 is about 14570.6934975656. The cubic root of 212305109 is about 596.5591094717.

The spelling of 212305109 in words is "two hundred twelve million, three hundred five thousand, one hundred nine".