4881643691 has 2 divisors, whose sum is σ = 4881643692. Its totient is φ = 4881643690.

The previous prime is 4881643661. The next prime is 4881643699. The reversal of 4881643691 is 1963461884.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4881643691 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (4881643699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2440821845 + 2440821846.

It is an arithmetic number, because the mean of its divisors is an integer number (2440821846).

Almost surely, 2^4881643691 is an apocalyptic number.

4881643691 is a deficient number, since it is larger than the sum of its proper divisors (1).

4881643691 is an equidigital number, since it uses as much as digits as its factorization.

4881643691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 50.

The square root of 4881643691 is about 69868.7604799169. The cubic root of 4881643691 is about 1696.3756337779.

It can be divided in two parts, 488 and 1643691, that multiplied together give a palindrome (802121208).

The spelling of 4881643691 in words is "four billion, eight hundred eighty-one million, six hundred forty-three thousand, six hundred ninety-one".