1287441217 has 4 divisors (see below), whose sum is σ = 1293214720. Its totient is φ = 1281667716.

The previous prime is 1287441209. The next prime is 1287441223. The reversal of 1287441217 is 7121447821.

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 1287441217 - 2³ = 1287441209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287441317) 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, 2886417 + ... + 2886862.

It is an arithmetic number, because the mean of its divisors is an integer number (323303680).

Almost surely, 2^1287441217 is an apocalyptic number.

It is an amenable number.

1287441217 is a deficient number, since it is larger than the sum of its proper divisors (5773503).

1287441217 is an equidigital number, since it uses as much as digits as its factorization.

1287441217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773502.

The product of its digits is 25088, while the sum is 37.

The square root of 1287441217 is about 35880.9311055329. The cubic root of 1287441217 is about 1087.8670003159.

The spelling of 1287441217 in words is "one billion, two hundred eighty-seven million, four hundred forty-one thousand, two hundred seventeen".