851981827 has 2 divisors, whose sum is σ = 851981828. Its totient is φ = 851981826.

The previous prime is 851981791. The next prime is 851981839. The reversal of 851981827 is 728189158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 851981827 - 2⁷ = 851981699 is a prime.

It is not a weakly prime, because it can be changed into another prime (851981887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425990913 + 425990914.

It is an arithmetic number, because the mean of its divisors is an integer number (425990914).

Almost surely, 2^851981827 is an apocalyptic number.

851981827 is a deficient number, since it is larger than the sum of its proper divisors (1).

851981827 is an equidigital number, since it uses as much as digits as its factorization.

851981827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 49.

The square root of 851981827 is about 29188.7277386323. The cubic root of 851981827 is about 948.0038703724.

It can be divided in two parts, 85198 and 1827, that added together give a square (87025 = 295²).

The spelling of 851981827 in words is "eight hundred fifty-one million, nine hundred eighty-one thousand, eight hundred twenty-seven".