1289487431 has 4 divisors (see below), whose sum is σ = 1292425200. Its totient is φ = 1286549664.

The previous prime is 1289487391. The next prime is 1289487457. The reversal of 1289487431 is 1347849821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1289487431 - 2¹⁴ = 1289471047 is a prime.

It is a super-2 number, since 2×1289487431² = 3325555669413959522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289487461) 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 3 ways as a sum of consecutive naturals, for example, 1468226 + ... + 1469103.

It is an arithmetic number, because the mean of its divisors is an integer number (323106300).

Almost surely, 2^1289487431 is an apocalyptic number.

1289487431 is a deficient number, since it is larger than the sum of its proper divisors (2937769).

1289487431 is an equidigital number, since it uses as much as digits as its factorization.

1289487431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2937768.

The product of its digits is 387072, while the sum is 47.

The square root of 1289487431 is about 35909.4337326558. The cubic root of 1289487431 is about 1088.4430344896.

The spelling of 1289487431 in words is "one billion, two hundred eighty-nine million, four hundred eighty-seven thousand, four hundred thirty-one".