1218075449 has 8 divisors (see below), whose sum is σ = 1304219880. Its totient is φ = 1133541376.

The previous prime is 1218075433. The next prime is 1218075451. The reversal of 1218075449 is 9445708121.

It can be written as a sum of positive squares in 4 ways, for example, as 456591424 + 761484025 = 21368^2 + 27595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1218075449 - 2⁴ = 1218075433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218075479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401024 + ... + 404049.

It is an arithmetic number, because the mean of its divisors is an integer number (163027485).

Almost surely, 2^1218075449 is an apocalyptic number.

It is an amenable number.

1218075449 is a deficient number, since it is larger than the sum of its proper divisors (86144431).

1218075449 is an equidigital number, since it uses as much as digits as its factorization.

1218075449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805179.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 1218075449 is about 34900.9376521606. The cubic root of 1218075449 is about 1067.9675655984.

The spelling of 1218075449 in words is "one billion, two hundred eighteen million, seventy-five thousand, four hundred forty-nine".