1641278851 has 2 divisors, whose sum is σ = 1641278852. Its totient is φ = 1641278850.

The previous prime is 1641278803. The next prime is 1641278861. The reversal of 1641278851 is 1588721461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1641278851 - 2¹⁷ = 1641147779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1641278798 and 1641278807.

It is not a weakly prime, because it can be changed into another prime (1641278861) 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, 820639425 + 820639426.

It is an arithmetic number, because the mean of its divisors is an integer number (820639426).

Almost surely, 2^1641278851 is an apocalyptic number.

1641278851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641278851 is an equidigital number, since it uses as much as digits as its factorization.

1641278851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 43.

The square root of 1641278851 is about 40512.6998730028. The cubic root of 1641278851 is about 1179.5801558655.

The spelling of 1641278851 in words is "one billion, six hundred forty-one million, two hundred seventy-eight thousand, eight hundred fifty-one".