1148711561 has 2 divisors, whose sum is σ = 1148711562. Its totient is φ = 1148711560.

The previous prime is 1148711461. The next prime is 1148711569. The reversal of 1148711561 is 1651178411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 733326400 + 415385161 = 27080^2 + 20381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1148711561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1148711569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 574355780 + 574355781.

It is an arithmetic number, because the mean of its divisors is an integer number (574355781).

Almost surely, 2^1148711561 is an apocalyptic number.

It is an amenable number.

1148711561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1148711561 is an equidigital number, since it uses as much as digits as its factorization.

1148711561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 35.

The square root of 1148711561 is about 33892.6475950168. The cubic root of 1148711561 is about 1047.2981362085.

Adding to 1148711561 its reverse (1651178411), we get a palindrome (2799889972).

The spelling of 1148711561 in words is "one billion, one hundred forty-eight million, seven hundred eleven thousand, five hundred sixty-one".