1217492489 has 2 divisors, whose sum is σ = 1217492490. Its totient is φ = 1217492488.

The previous prime is 1217492461. The next prime is 1217492491. The reversal of 1217492489 is 9842947121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1183910464 + 33582025 = 34408^2 + 5795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217492489 - 2²⁰ = 1216443913 is a prime.

Together with 1217492491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1217492429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608746244 + 608746245.

It is an arithmetic number, because the mean of its divisors is an integer number (608746245).

Almost surely, 2^1217492489 is an apocalyptic number.

It is an amenable number.

1217492489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217492489 is an equidigital number, since it uses as much as digits as its factorization.

1217492489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 1217492489 is about 34892.5850145844. The cubic root of 1217492489 is about 1067.7971651744.

The spelling of 1217492489 in words is "one billion, two hundred seventeen million, four hundred ninety-two thousand, four hundred eighty-nine".