1080721111 has 4 divisors (see below), whose sum is σ = 1085843224. Its totient is φ = 1075599000.

The previous prime is 1080721073. The next prime is 1080721129. The reversal of 1080721111 is 1111270801.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1080721111 - 2⁷ = 1080720983 is a prime.

It is a super-2 number, since 2×1080721111² = 2335916239522148642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1080721141) 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 in 3 ways as a sum of consecutive naturals, for example, 2560740 + ... + 2561161.

It is an arithmetic number, because the mean of its divisors is an integer number (271460806).

Almost surely, 2^1080721111 is an apocalyptic number.

1080721111 is a deficient number, since it is larger than the sum of its proper divisors (5122113).

1080721111 is an equidigital number, since it uses as much as digits as its factorization.

1080721111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5122112.

The product of its (nonzero) digits is 112, while the sum is 22.

The square root of 1080721111 is about 32874.3229740173. The cubic root of 1080721111 is about 1026.2138658070.

Adding to 1080721111 its reverse (1111270801), we get a palindrome (2191991912).

The spelling of 1080721111 in words is "one billion, eighty million, seven hundred twenty-one thousand, one hundred eleven".