1103712721 has 2 divisors, whose sum is σ = 1103712722. Its totient is φ = 1103712720.

The previous prime is 1103712667. The next prime is 1103712751. The reversal of 1103712721 is 1272173011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670240321 + 433472400 = 25889^2 + 20820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1103712721 - 2¹³ = 1103704529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1103712751) 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, 551856360 + 551856361.

It is an arithmetic number, because the mean of its divisors is an integer number (551856361).

Almost surely, 2^1103712721 is an apocalyptic number.

It is an amenable number.

1103712721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103712721 is an equidigital number, since it uses as much as digits as its factorization.

1103712721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 1103712721 is about 33222.1721294680. The cubic root of 1103712721 is about 1033.4401955273.

Adding to 1103712721 its reverse (1272173011), we get a palindrome (2375885732).

The spelling of 1103712721 in words is "one billion, one hundred three million, seven hundred twelve thousand, seven hundred twenty-one".