851512591 has 2 divisors, whose sum is σ = 851512592. Its totient is φ = 851512590.

The previous prime is 851512567. The next prime is 851512621. The reversal of 851512591 is 195215158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851512591 - 2²¹ = 849415439 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 851512591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851512511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425756295 + 425756296.

It is an arithmetic number, because the mean of its divisors is an integer number (425756296).

Almost surely, 2^851512591 is an apocalyptic number.

851512591 is a deficient number, since it is larger than the sum of its proper divisors (1).

851512591 is an equidigital number, since it uses as much as digits as its factorization.

851512591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 37.

The square root of 851512591 is about 29180.6886656227. The cubic root of 851512591 is about 947.8297981011.

The spelling of 851512591 in words is "eight hundred fifty-one million, five hundred twelve thousand, five hundred ninety-one".