1143045861 has 4 divisors (see below), whose sum is σ = 1524061152. Its totient is φ = 762030572.

The previous prime is 1143045821. The next prime is 1143045863. The reversal of 1143045861 is 1685403411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1143045861 - 2¹³ = 1143037669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143045863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190507641 + ... + 190507646.

It is an arithmetic number, because the mean of its divisors is an integer number (381015288).

Almost surely, 2^1143045861 is an apocalyptic number.

It is an amenable number.

1143045861 is a deficient number, since it is larger than the sum of its proper divisors (381015291).

1143045861 is an equidigital number, since it uses as much as digits as its factorization.

1143045861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381015290.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1143045861 is about 33808.9612528986. The cubic root of 1143045861 is about 1045.5734620969.

It can be divided in two parts, 11430 and 45861, that added together give a triangular number (57291 = T₃₃₈).

The spelling of 1143045861 in words is "one billion, one hundred forty-three million, forty-five thousand, eight hundred sixty-one".