212009687849 has 2 divisors, whose sum is σ = 212009687850. Its totient is φ = 212009687848.

The previous prime is 212009687807. The next prime is 212009687893. The reversal of 212009687849 is 948786900212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211705813225 + 303874624 = 460115^2 + 17432^2 .

It is a cyclic number.

It is not a de Polignac number, because 212009687849 - 2¹⁶ = 212009622313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212009687794 and 212009687803.

It is not a weakly prime, because it can be changed into another prime (212009687899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106004843924 + 106004843925.

It is an arithmetic number, because the mean of its divisors is an integer number (106004843925).

Almost surely, 2^212009687849 is an apocalyptic number.

It is an amenable number.

212009687849 is a deficient number, since it is larger than the sum of its proper divisors (1).

212009687849 is an equidigital number, since it uses as much as digits as its factorization.

212009687849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 212009687849 in words is "two hundred twelve billion, nine million, six hundred eighty-seven thousand, eight hundred forty-nine".