1103311721 has 2 divisors, whose sum is σ = 1103311722. Its totient is φ = 1103311720.

The previous prime is 1103311711. The next prime is 1103311739. The reversal of 1103311721 is 1271133011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1007173696 + 96138025 = 31736^2 + 9805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1103311721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1103311693 and 1103311702.

It is not a weakly prime, because it can be changed into another prime (1103311711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551655860 + 551655861.

It is an arithmetic number, because the mean of its divisors is an integer number (551655861).

Almost surely, 2^1103311721 is an apocalyptic number.

It is an amenable number.

1103311721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103311721 is an equidigital number, since it uses as much as digits as its factorization.

1103311721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 1103311721 is about 33216.1364550424. The cubic root of 1103311721 is about 1033.3150241524.

Adding to 1103311721 its reverse (1271133011), we get a palindrome (2374444732).

The spelling of 1103311721 in words is "one billion, one hundred three million, three hundred eleven thousand, seven hundred twenty-one".