1143249561 has 6 divisors (see below), whose sum is σ = 1651360490. Its totient is φ = 762166368.

The previous prime is 1143249559. The next prime is 1143249587. The reversal of 1143249561 is 1659423411.

It is a happy number.

1143249561 is a `hidden beast` number, since 11 + 43 + 2 + 49 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1049760000 + 93489561 = 32400^2 + 9669^2 .

It is not a de Polignac number, because 1143249561 - 2¹ = 1143249559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1143249511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63513856 + ... + 63513873.

Almost surely, 2^1143249561 is an apocalyptic number.

It is an amenable number.

1143249561 is a deficient number, since it is larger than the sum of its proper divisors (508110929).

1143249561 is a wasteful number, since it uses less digits than its factorization.

1143249561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127027735 (or 127027732 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1143249561 is about 33811.9736336109. The cubic root of 1143249561 is about 1045.6355682850.

The spelling of 1143249561 in words is "one billion, one hundred forty-three million, two hundred forty-nine thousand, five hundred sixty-one".