851580491 has 2 divisors, whose sum is σ = 851580492. Its totient is φ = 851580490.

The previous prime is 851580481. The next prime is 851580529. The reversal of 851580491 is 194085158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851580491 - 2⁶ = 851580427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (851580481) 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, 425790245 + 425790246.

It is an arithmetic number, because the mean of its divisors is an integer number (425790246).

Almost surely, 2^851580491 is an apocalyptic number.

851580491 is a deficient number, since it is larger than the sum of its proper divisors (1).

851580491 is an equidigital number, since it uses as much as digits as its factorization.

851580491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 41.

The square root of 851580491 is about 29181.8520831012. The cubic root of 851580491 is about 947.8549908907.

The spelling of 851580491 in words is "eight hundred fifty-one million, five hundred eighty thousand, four hundred ninety-one".