4809961991 has 2 divisors, whose sum is σ = 4809961992. Its totient is φ = 4809961990.

The previous prime is 4809961987. The next prime is 4809962023. The reversal of 4809961991 is 1991699084.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4809961991 - 2² = 4809961987 is a prime.

It is a super-3 number, since 3×4809961991³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4809961901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2404980995 + 2404980996.

It is an arithmetic number, because the mean of its divisors is an integer number (2404980996).

Almost surely, 2^4809961991 is an apocalyptic number.

4809961991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4809961991 is an equidigital number, since it uses as much as digits as its factorization.

4809961991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 56.

The square root of 4809961991 is about 69353.8895160178. The cubic root of 4809961991 is about 1688.0315059622.

The spelling of 4809961991 in words is "four billion, eight hundred nine million, nine hundred sixty-one thousand, nine hundred ninety-one".