1143013661 has 2 divisors, whose sum is σ = 1143013662. Its totient is φ = 1143013660.

The previous prime is 1143013643. The next prime is 1143013687. The reversal of 1143013661 is 1663103411.

It is an a-pointer prime, because the next prime (1143013687) can be obtained adding 1143013661 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 880249561 + 262764100 = 29669^2 + 16210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1143013661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1143013661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143013601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571506830 + 571506831.

It is an arithmetic number, because the mean of its divisors is an integer number (571506831).

Almost surely, 2^1143013661 is an apocalyptic number.

It is an amenable number.

1143013661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143013661 is an equidigital number, since it uses as much as digits as its factorization.

1143013661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1143013661 is about 33808.4850444382. The cubic root of 1143013661 is about 1045.5636439485.

The spelling of 1143013661 in words is "one billion, one hundred forty-three million, thirteen thousand, six hundred sixty-one".