1103555261 has 2 divisors, whose sum is σ = 1103555262. Its totient is φ = 1103555260.

The previous prime is 1103555251. The next prime is 1103555273. The reversal of 1103555261 is 1625553011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 801456100 + 302099161 = 28310^2 + 17381^2 .

It is an emirp because it is prime and its reverse (1625553011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1103555261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1103555231) 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 as a sum of consecutive naturals, namely, 551777630 + 551777631.

It is an arithmetic number, because the mean of its divisors is an integer number (551777631).

Almost surely, 2^1103555261 is an apocalyptic number.

It is an amenable number.

1103555261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103555261 is an equidigital number, since it uses as much as digits as its factorization.

1103555261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1103555261 is about 33219.8022420363. The cubic root of 1103555261 is about 1033.3910483083.

The spelling of 1103555261 in words is "one billion, one hundred three million, five hundred fifty-five thousand, two hundred sixty-one".