1267198489 has 2 divisors, whose sum is σ = 1267198490. Its totient is φ = 1267198488.

The previous prime is 1267198487. The next prime is 1267198511. The reversal of 1267198489 is 9848917621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1173747600 + 93450889 = 34260^2 + 9667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267198489 - 2¹ = 1267198487 is a prime.

Together with 1267198487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1267198481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633599244 + 633599245.

It is an arithmetic number, because the mean of its divisors is an integer number (633599245).

Almost surely, 2^1267198489 is an apocalyptic number.

It is an amenable number.

1267198489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267198489 is an equidigital number, since it uses as much as digits as its factorization.

1267198489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 55.

The square root of 1267198489 is about 35597.7315148030. The cubic root of 1267198489 is about 1082.1352614877.

The spelling of 1267198489 in words is "one billion, two hundred sixty-seven million, one hundred ninety-eight thousand, four hundred eighty-nine".