1284494217 has 4 divisors (see below), whose sum is σ = 1712658960. Its totient is φ = 856329476.

The previous prime is 1284494173. The next prime is 1284494227. The reversal of 1284494217 is 7124944821.

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 1284494217 - 2⁶ = 1284494153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1284494227) 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, 214082367 + ... + 214082372.

It is an arithmetic number, because the mean of its divisors is an integer number (428164740).

Almost surely, 2^1284494217 is an apocalyptic number.

It is an amenable number.

1284494217 is a deficient number, since it is larger than the sum of its proper divisors (428164743).

1284494217 is an equidigital number, since it uses as much as digits as its factorization.

1284494217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428164742.

The product of its digits is 129024, while the sum is 42.

The square root of 1284494217 is about 35839.8411966348. The cubic root of 1284494217 is about 1087.0363103919.

The spelling of 1284494217 in words is "one billion, two hundred eighty-four million, four hundred ninety-four thousand, two hundred seventeen".