1489709509 has 4 divisors (see below), whose sum is σ = 1521405504. Its totient is φ = 1458013516.

The previous prime is 1489709489. The next prime is 1489709537. The reversal of 1489709509 is 9059079841.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9059079841 = 7 ⋅1294154263.

It is a cyclic number.

It is not a de Polignac number, because 1489709509 - 2⁵ = 1489709477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1489709209) 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, 15847927 + ... + 15848020.

It is an arithmetic number, because the mean of its divisors is an integer number (380351376).

Almost surely, 2^1489709509 is an apocalyptic number.

It is an amenable number.

1489709509 is a deficient number, since it is larger than the sum of its proper divisors (31695995).

1489709509 is an equidigital number, since it uses as much as digits as its factorization.

1489709509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31695994.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 1489709509 is about 38596.7551615418. The cubic root of 1489709509 is about 1142.0905287274.

The spelling of 1489709509 in words is "one billion, four hundred eighty-nine million, seven hundred nine thousand, five hundred nine".