812350859281 has 4 divisors (see below), whose sum is σ = 874839386932. Its totient is φ = 749862331632.

The previous prime is 812350859279. The next prime is 812350859291. The reversal of 812350859281 is 182958053218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40836326400 + 771514532881 = 202080^2 + 878359^2 .

It is a cyclic number.

It is not a de Polignac number, because 812350859281 - 2¹ = 812350859279 is a prime.

It is a super-2 number, since 2×812350859281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812350859291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31244263806 + ... + 31244263831.

It is an arithmetic number, because the mean of its divisors is an integer number (218709846733).

Almost surely, 2^812350859281 is an apocalyptic number.

It is an amenable number.

812350859281 is a deficient number, since it is larger than the sum of its proper divisors (62488527651).

812350859281 is a wasteful number, since it uses less digits than its factorization.

812350859281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62488527650.

The product of its (nonzero) digits is 1382400, while the sum is 52.

The spelling of 812350859281 in words is "eight hundred twelve billion, three hundred fifty million, eight hundred fifty-nine thousand, two hundred eighty-one".