1489581861 has 4 divisors (see below), whose sum is σ = 1986109152. Its totient is φ = 993054572.

The previous prime is 1489581833. The next prime is 1489581889. The reversal of 1489581861 is 1681859841.

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 an interprime number because it is at equal distance from previous prime (1489581833) and next prime (1489581889).

It is a cyclic number.

It is not a de Polignac number, because 1489581861 - 2⁵ = 1489581829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1489581811) 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, 248263641 + ... + 248263646.

It is an arithmetic number, because the mean of its divisors is an integer number (496527288).

Almost surely, 2^1489581861 is an apocalyptic number.

It is an amenable number.

1489581861 is a deficient number, since it is larger than the sum of its proper divisors (496527291).

1489581861 is an equidigital number, since it uses as much as digits as its factorization.

1489581861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496527290.

The product of its digits is 552960, while the sum is 51.

The square root of 1489581861 is about 38595.1015156069. The cubic root of 1489581861 is about 1142.0579072140.

The spelling of 1489581861 in words is "one billion, four hundred eighty-nine million, five hundred eighty-one thousand, eight hundred sixty-one".