1155561049 has 2 divisors, whose sum is σ = 1155561050. Its totient is φ = 1155561048.

The previous prime is 1155561037. The next prime is 1155561089. The reversal of 1155561049 is 9401655511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1080305424 + 75255625 = 32868^2 + 8675^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155561049 - 2¹⁹ = 1155036761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1155560999 and 1155561017.

It is not a weakly prime, because it can be changed into another prime (1155561089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577780524 + 577780525.

It is an arithmetic number, because the mean of its divisors is an integer number (577780525).

Almost surely, 2^1155561049 is an apocalyptic number.

It is an amenable number.

1155561049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155561049 is an equidigital number, since it uses as much as digits as its factorization.

1155561049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 37.

The square root of 1155561049 is about 33993.5442253378. The cubic root of 1155561049 is about 1049.3756073061.

The spelling of 1155561049 in words is "one billion, one hundred fifty-five million, five hundred sixty-one thousand, forty-nine".