2851518781 has 2 divisors, whose sum is σ = 2851518782. Its totient is φ = 2851518780.

The previous prime is 2851518779. The next prime is 2851518823. The reversal of 2851518781 is 1878151582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2780874756 + 70644025 = 52734^2 + 8405^2 .

It is a cyclic number.

It is not a de Polignac number, because 2851518781 - 2¹ = 2851518779 is a prime.

It is a super-2 number, since 2×2851518781² = 16262318716791451922, which contains 22 as substring.

Together with 2851518779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2851518721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1425759390 + 1425759391.

It is an arithmetic number, because the mean of its divisors is an integer number (1425759391).

Almost surely, 2^2851518781 is an apocalyptic number.

It is an amenable number.

2851518781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2851518781 is an equidigital number, since it uses as much as digits as its factorization.

2851518781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 179200, while the sum is 46.

The square root of 2851518781 is about 53399.6140529124. The cubic root of 2851518781 is about 1418.0517454757.

The spelling of 2851518781 in words is "two billion, eight hundred fifty-one million, five hundred eighteen thousand, seven hundred eighty-one".