1985860801 has 2 divisors, whose sum is σ = 1985860802. Its totient is φ = 1985860800.

The previous prime is 1985860783. The next prime is 1985860823. The reversal of 1985860801 is 1080685891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1317690000 + 668170801 = 36300^2 + 25849^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985860801 - 2²³ = 1977472193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985860001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992930400 + 992930401.

It is an arithmetic number, because the mean of its divisors is an integer number (992930401).

Almost surely, 2^1985860801 is an apocalyptic number.

It is an amenable number.

1985860801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985860801 is an equidigital number, since it uses as much as digits as its factorization.

1985860801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 46.

The square root of 1985860801 is about 44562.9981150281. The cubic root of 1985860801 is about 1256.9449798887.

The spelling of 1985860801 in words is "one billion, nine hundred eighty-five million, eight hundred sixty thousand, eight hundred one".