1081660321 has 8 divisors (see below), whose sum is σ = 1242396800. Its totient is φ = 922477248.

The previous prime is 1081660271. The next prime is 1081660361. The reversal of 1081660321 is 1230661801.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1081660321 - 2⁷ = 1081660193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1081660321.

It is not an unprimeable number, because it can be changed into a prime (1081660361) 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 in 7 ways as a sum of consecutive naturals, for example, 386856 + ... + 389641.

It is an arithmetic number, because the mean of its divisors is an integer number (155299600).

Almost surely, 2^1081660321 is an apocalyptic number.

It is an amenable number.

1081660321 is a deficient number, since it is larger than the sum of its proper divisors (160736479).

1081660321 is an equidigital number, since it uses as much as digits as its factorization.

1081660321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776703.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1081660321 is about 32888.6047286898. The cubic root of 1081660321 is about 1026.5110597335.

The spelling of 1081660321 in words is "one billion, eighty-one million, six hundred sixty thousand, three hundred twenty-one".