851813361 has 32 divisors (see below), whose sum is σ = 1448595200. Its totient is φ = 484600320.

The previous prime is 851813321. The next prime is 851813363. The reversal of 851813361 is 163318158.

851813361 is a `hidden beast` number, since 8 + 518 + 133 + 6 + 1 = 666.

It is not a de Polignac number, because 851813361 - 2⁷ = 851813233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851813363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33441 + ... + 53121.

It is an arithmetic number, because the mean of its divisors is an integer number (45268600).

Almost surely, 2^851813361 is an apocalyptic number.

It is an amenable number.

851813361 is a deficient number, since it is larger than the sum of its proper divisors (596781839).

851813361 is a wasteful number, since it uses less digits than its factorization.

851813361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19926 (or 19920 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 851813361 is about 29185.8417901557. The cubic root of 851813361 is about 947.9413819708.

The spelling of 851813361 in words is "eight hundred fifty-one million, eight hundred thirteen thousand, three hundred sixty-one".