851663441 has 2 divisors, whose sum is σ = 851663442. Its totient is φ = 851663440.

The previous prime is 851663401. The next prime is 851663471. The reversal of 851663441 is 144366158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453860416 + 397803025 = 21304^2 + 19945^2 .

It is a cyclic number.

It is not a de Polignac number, because 851663441 - 2¹⁰ = 851662417 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 851663395 and 851663404.

It is not a weakly prime, because it can be changed into another prime (851663401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425831720 + 425831721.

It is an arithmetic number, because the mean of its divisors is an integer number (425831721).

Almost surely, 2^851663441 is an apocalyptic number.

It is an amenable number.

851663441 is a deficient number, since it is larger than the sum of its proper divisors (1).

851663441 is an equidigital number, since it uses as much as digits as its factorization.

851663441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 851663441 is about 29183.2733085238. The cubic root of 851663441 is about 947.8857658320.

The spelling of 851663441 in words is "eight hundred fifty-one million, six hundred sixty-three thousand, four hundred forty-one".