6418513891 has 2 divisors, whose sum is σ = 6418513892. Its totient is φ = 6418513890.

The previous prime is 6418513853. The next prime is 6418513909. The reversal of 6418513891 is 1983158146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6418513891 - 2¹¹ = 6418511843 is a prime.

It is not a weakly prime, because it can be changed into another prime (6418513811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3209256945 + 3209256946.

It is an arithmetic number, because the mean of its divisors is an integer number (3209256946).

Almost surely, 2^6418513891 is an apocalyptic number.

6418513891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6418513891 is an equidigital number, since it uses as much as digits as its factorization.

6418513891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The square root of 6418513891 is about 80115.6282569138. The cubic root of 6418513891 is about 1858.4240988536.

The spelling of 6418513891 in words is "six billion, four hundred eighteen million, five hundred thirteen thousand, eight hundred ninety-one".