1213210489 has 2 divisors, whose sum is σ = 1213210490. Its totient is φ = 1213210488.

The previous prime is 1213210429. The next prime is 1213210507. The reversal of 1213210489 is 9840123121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 693005625 + 520204864 = 26325^2 + 22808^2 .

It is an emirp because it is prime and its reverse (9840123121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213210489 - 2¹¹ = 1213208441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213210489.

It is not a weakly prime, because it can be changed into another prime (1213210429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606605244 + 606605245.

It is an arithmetic number, because the mean of its divisors is an integer number (606605245).

Almost surely, 2^1213210489 is an apocalyptic number.

It is an amenable number.

1213210489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213210489 is an equidigital number, since it uses as much as digits as its factorization.

1213210489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1213210489 is about 34831.1712263599. The cubic root of 1213210489 is about 1066.5438574214.

The spelling of 1213210489 in words is "one billion, two hundred thirteen million, two hundred ten thousand, four hundred eighty-nine".