1431489809 has 4 divisors (see below), whose sum is σ = 1431566004. Its totient is φ = 1431413616.

The previous prime is 1431489803. The next prime is 1431489827. The reversal of 1431489809 is 9089841341.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9089841341 = 7 ⋅1298548763.

It can be written as a sum of positive squares in 2 ways, for example, as 832611025 + 598878784 = 28855^2 + 24472^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431489809 - 2¹⁶ = 1431424273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1431489803) 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, 12359 + ... + 54915.

It is an arithmetic number, because the mean of its divisors is an integer number (357891501).

Almost surely, 2^1431489809 is an apocalyptic number.

It is an amenable number.

1431489809 is a deficient number, since it is larger than the sum of its proper divisors (76195).

1431489809 is an equidigital number, since it uses as much as digits as its factorization.

1431489809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76194.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 1431489809 is about 37835.0341482600. The cubic root of 1431489809 is about 1127.0142834075.

The spelling of 1431489809 in words is "one billion, four hundred thirty-one million, four hundred eighty-nine thousand, eight hundred nine".