1143011661 has 16 divisors (see below), whose sum is σ = 1690744320. Its totient is φ = 680991920.

The previous prime is 1143011567. The next prime is 1143011663. The reversal of 1143011661 is 1661103411.

It is a cyclic number.

It is not a de Polignac number, because 1143011661 - 2²⁹ = 606140749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143011663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291585 + ... + 295478.

It is an arithmetic number, because the mean of its divisors is an integer number (105671520).

Almost surely, 2^1143011661 is an apocalyptic number.

1143011661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1143011661 is a deficient number, since it is larger than the sum of its proper divisors (547732659).

1143011661 is a wasteful number, since it uses less digits than its factorization.

1143011661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587136.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1143011661 is about 33808.4554660517. The cubic root of 1143011661 is about 1045.5630341196.

The spelling of 1143011661 in words is "one billion, one hundred forty-three million, eleven thousand, six hundred sixty-one".