4931051861 has 2 divisors, whose sum is σ = 4931051862. Its totient is φ = 4931051860.

The previous prime is 4931051831. The next prime is 4931051899. The reversal of 4931051861 is 1681501394.

It is an a-pointer prime, because the next prime (4931051899) can be obtained adding 4931051861 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4914851236 + 16200625 = 70106^2 + 4025^2 .

It is a cyclic number.

It is not a de Polignac number, because 4931051861 - 2¹⁰ = 4931050837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4931051831) 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, 2465525930 + 2465525931.

It is an arithmetic number, because the mean of its divisors is an integer number (2465525931).

Almost surely, 2^4931051861 is an apocalyptic number.

It is an amenable number.

4931051861 is a deficient number, since it is larger than the sum of its proper divisors (1).

4931051861 is an equidigital number, since it uses as much as digits as its factorization.

4931051861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 4931051861 is about 70221.4487247308. The cubic root of 4931051861 is about 1702.0795613233.

The spelling of 4931051861 in words is "four billion, nine hundred thirty-one million, fifty-one thousand, eight hundred sixty-one".