6815420291 has 2 divisors, whose sum is σ = 6815420292. Its totient is φ = 6815420290.

The previous prime is 6815420197. The next prime is 6815420303. The reversal of 6815420291 is 1920245186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6815420291 is a prime.

It is not a weakly prime, because it can be changed into another prime (6815422291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3407710145 + 3407710146.

It is an arithmetic number, because the mean of its divisors is an integer number (3407710146).

Almost surely, 2^6815420291 is an apocalyptic number.

6815420291 is a deficient number, since it is larger than the sum of its proper divisors (1).

6815420291 is an equidigital number, since it uses as much as digits as its factorization.

6815420291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 6815420291 is about 82555.5588134439. The cubic root of 6815420291 is about 1895.9674669468.

The spelling of 6815420291 in words is "six billion, eight hundred fifteen million, four hundred twenty thousand, two hundred ninety-one".