1217284849 has 4 divisors (see below), whose sum is σ = 1327947120. Its totient is φ = 1106622580.

The previous prime is 1217284841. The next prime is 1217284891. The reversal of 1217284849 is 9484827121.

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 1217284849 - 2³ = 1217284841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1217284799 and 1217284808.

It is not an unprimeable number, because it can be changed into a prime (1217284841) 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, 55331119 + ... + 55331140.

It is an arithmetic number, because the mean of its divisors is an integer number (331986780).

Almost surely, 2^1217284849 is an apocalyptic number.

It is an amenable number.

1217284849 is a deficient number, since it is larger than the sum of its proper divisors (110662271).

1217284849 is a wasteful number, since it uses less digits than its factorization.

1217284849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110662270.

The product of its digits is 258048, while the sum is 46.

The square root of 1217284849 is about 34889.6094704426. The cubic root of 1217284849 is about 1067.7364584319.

The spelling of 1217284849 in words is "one billion, two hundred seventeen million, two hundred eighty-four thousand, eight hundred forty-nine".