851663471 has 2 divisors, whose sum is σ = 851663472. Its totient is φ = 851663470.

The previous prime is 851663441. The next prime is 851663489. The reversal of 851663471 is 174366158.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851663471 is a prime.

It is a super-3 number, since 3×851663471³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851663401) 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, 425831735 + 425831736.

It is an arithmetic number, because the mean of its divisors is an integer number (425831736).

Almost surely, 2^851663471 is an apocalyptic number.

851663471 is a deficient number, since it is larger than the sum of its proper divisors (1).

851663471 is an equidigital number, since it uses as much as digits as its factorization.

851663471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 851663471 is about 29183.2738225169. The cubic root of 851663471 is about 947.8857769618.

The spelling of 851663471 in words is "eight hundred fifty-one million, six hundred sixty-three thousand, four hundred seventy-one".