2851651681 has 2 divisors, whose sum is σ = 2851651682. Its totient is φ = 2851651680.

The previous prime is 2851651657. The next prime is 2851651709. The reversal of 2851651681 is 1861561582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2738952225 + 112699456 = 52335^2 + 10616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2851651681 is a prime.

It is a super-2 number, since 2×2851651681² = 16263834619500251522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2851651181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1425825840 + 1425825841.

It is an arithmetic number, because the mean of its divisors is an integer number (1425825841).

Almost surely, 2^2851651681 is an apocalyptic number.

It is an amenable number.

2851651681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2851651681 is an equidigital number, since it uses as much as digits as its factorization.

2851651681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 43.

The square root of 2851651681 is about 53400.8584294298. The cubic root of 2851651681 is about 1418.0737753907.

Subtracting from 2851651681 its reverse (1861561582), we obtain a palindrome (990090099).

The spelling of 2851651681 in words is "two billion, eight hundred fifty-one million, six hundred fifty-one thousand, six hundred eighty-one".