1155547361 has 2 divisors, whose sum is σ = 1155547362. Its totient is φ = 1155547360.

The previous prime is 1155547357. The next prime is 1155547373. The reversal of 1155547361 is 1637455511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657409600 + 498137761 = 25640^2 + 22319^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155547361 - 2² = 1155547357 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155546361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577773680 + 577773681.

It is an arithmetic number, because the mean of its divisors is an integer number (577773681).

Almost surely, 2^1155547361 is an apocalyptic number.

It is an amenable number.

1155547361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155547361 is an equidigital number, since it uses as much as digits as its factorization.

1155547361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 38.

The square root of 1155547361 is about 33993.3428923959. The cubic root of 1155547361 is about 1049.3714638902.

The spelling of 1155547361 in words is "one billion, one hundred fifty-five million, five hundred forty-seven thousand, three hundred sixty-one".