851530811 has 2 divisors, whose sum is σ = 851530812. Its totient is φ = 851530810.

The previous prime is 851530777. The next prime is 851530871. The reversal of 851530811 is 118035158.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851530811 - 2⁶ = 851530747 is a prime.

It is not a weakly prime, because it can be changed into another prime (851530871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425765405 + 425765406.

It is an arithmetic number, because the mean of its divisors is an integer number (425765406).

Almost surely, 2^851530811 is an apocalyptic number.

851530811 is a deficient number, since it is larger than the sum of its proper divisors (1).

851530811 is an equidigital number, since it uses as much as digits as its factorization.

851530811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 32.

The square root of 851530811 is about 29181.0008567218. Note that the first 3 decimals coincide. The cubic root of 851530811 is about 947.8365583596.

Adding to 851530811 its reverse (118035158), we get a palindrome (969565969).

The spelling of 851530811 in words is "eight hundred fifty-one million, five hundred thirty thousand, eight hundred eleven".