851672849 has 2 divisors, whose sum is σ = 851672850. Its totient is φ = 851672848.

The previous prime is 851672753. The next prime is 851672873. The reversal of 851672849 is 948276158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 481495249 + 370177600 = 21943^2 + 19240^2 .

It is a cyclic number.

It is not a de Polignac number, because 851672849 - 2¹⁶ = 851607313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 851672797 and 851672806.

It is not a weakly prime, because it can be changed into another prime (851672879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425836424 + 425836425.

It is an arithmetic number, because the mean of its divisors is an integer number (425836425).

Almost surely, 2^851672849 is an apocalyptic number.

It is an amenable number.

851672849 is a deficient number, since it is larger than the sum of its proper divisors (1).

851672849 is an equidigital number, since it uses as much as digits as its factorization.

851672849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 50.

The square root of 851672849 is about 29183.4344963029. The cubic root of 851672849 is about 947.8892561296.

The spelling of 851672849 in words is "eight hundred fifty-one million, six hundred seventy-two thousand, eight hundred forty-nine".