285961321 has 2 divisors, whose sum is σ = 285961322. Its totient is φ = 285961320.

The previous prime is 285961307. The next prime is 285961327. The reversal of 285961321 is 123169582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155750400 + 130210921 = 12480^2 + 11411^2 .

It is a cyclic number.

It is not a de Polignac number, because 285961321 - 2⁹ = 285960809 is a prime.

It is not a weakly prime, because it can be changed into another prime (285961327) 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, 142980660 + 142980661.

It is an arithmetic number, because the mean of its divisors is an integer number (142980661).

Almost surely, 2^285961321 is an apocalyptic number.

It is an amenable number.

285961321 is a deficient number, since it is larger than the sum of its proper divisors (1).

285961321 is an equidigital number, since it uses as much as digits as its factorization.

285961321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 285961321 is about 16910.3909180125. The cubic root of 285961321 is about 658.8235247338.

The spelling of 285961321 in words is "two hundred eighty-five million, nine hundred sixty-one thousand, three hundred twenty-one".