851804449 has 2 divisors, whose sum is σ = 851804450. Its totient is φ = 851804448.

The previous prime is 851804441. The next prime is 851804483. The reversal of 851804449 is 944408158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 478078225 + 373726224 = 21865^2 + 19332^2 .

It is a cyclic number.

It is not a de Polignac number, because 851804449 - 2³ = 851804441 is a prime.

It is a super-3 number, since 3×851804449³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (851804441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425902224 + 425902225.

It is an arithmetic number, because the mean of its divisors is an integer number (425902225).

Almost surely, 2^851804449 is an apocalyptic number.

It is an amenable number.

851804449 is a deficient number, since it is larger than the sum of its proper divisors (1).

851804449 is an equidigital number, since it uses as much as digits as its factorization.

851804449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 851804449 is about 29185.6891129882. The cubic root of 851804449 is about 947.9380760498.

The spelling of 851804449 in words is "eight hundred fifty-one million, eight hundred four thousand, four hundred forty-nine".