812851069 has 2 divisors, whose sum is σ = 812851070. Its totient is φ = 812851068.

The previous prime is 812851057. The next prime is 812851139. The reversal of 812851069 is 960158218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 780531844 + 32319225 = 27938^2 + 5685^2 .

It is a cyclic number.

It is not a de Polignac number, because 812851069 - 2⁵ = 812851037 is a prime.

It is a super-2 number, since 2×812851069² = 1321453720748885522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812851009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406425534 + 406425535.

It is an arithmetic number, because the mean of its divisors is an integer number (406425535).

Almost surely, 2^812851069 is an apocalyptic number.

It is an amenable number.

812851069 is a deficient number, since it is larger than the sum of its proper divisors (1).

812851069 is an equidigital number, since it uses as much as digits as its factorization.

812851069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 812851069 is about 28510.5431200460. The cubic root of 812851069 is about 933.2621666684.

The spelling of 812851069 in words is "eight hundred twelve million, eight hundred fifty-one thousand, sixty-nine".