1085304721 has 2 divisors, whose sum is σ = 1085304722. Its totient is φ = 1085304720.

The previous prime is 1085304713. The next prime is 1085304743. The reversal of 1085304721 is 1274035801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085043600 + 261121 = 32940^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1085304721 - 2³ = 1085304713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1085304791) 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, 542652360 + 542652361.

It is an arithmetic number, because the mean of its divisors is an integer number (542652361).

Almost surely, 2^1085304721 is an apocalyptic number.

It is an amenable number.

1085304721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085304721 is an equidigital number, since it uses as much as digits as its factorization.

1085304721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1085304721 is about 32943.9633468713. The cubic root of 1085304721 is about 1027.6626298978.

The spelling of 1085304721 in words is "one billion, eighty-five million, three hundred four thousand, seven hundred twenty-one".