6942215849 has 2 divisors, whose sum is σ = 6942215850. Its totient is φ = 6942215848.

The previous prime is 6942215821. The next prime is 6942215869. The reversal of 6942215849 is 9485122496.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6097267225 + 844948624 = 78085^2 + 29068^2 .

It is a cyclic number.

It is not a de Polignac number, because 6942215849 - 2¹² = 6942211753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6942215797 and 6942215806.

It is not a weakly prime, because it can be changed into another prime (6942215869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3471107924 + 3471107925.

It is an arithmetic number, because the mean of its divisors is an integer number (3471107925).

Almost surely, 2^6942215849 is an apocalyptic number.

It is an amenable number.

6942215849 is a deficient number, since it is larger than the sum of its proper divisors (1).

6942215849 is an equidigital number, since it uses as much as digits as its factorization.

6942215849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 50.

The square root of 6942215849 is about 83319.9606877008. The cubic root of 6942215849 is about 1907.6529606908.

The spelling of 6942215849 in words is "six billion, nine hundred forty-two million, two hundred fifteen thousand, eight hundred forty-nine".