1217212459 has 2 divisors, whose sum is σ = 1217212460. Its totient is φ = 1217212458.

The previous prime is 1217212457. The next prime is 1217212471. The reversal of 1217212459 is 9542127121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1217212459 - 2¹ = 1217212457 is a prime.

Together with 1217212457, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1217212453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608606229 + 608606230.

It is an arithmetic number, because the mean of its divisors is an integer number (608606230).

Almost surely, 2^1217212459 is an apocalyptic number.

1217212459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217212459 is an equidigital number, since it uses as much as digits as its factorization.

1217212459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 1217212459 is about 34888.5720401394. The cubic root of 1217212459 is about 1067.7152924809.

The spelling of 1217212459 in words is "one billion, two hundred seventeen million, two hundred twelve thousand, four hundred fifty-nine".