1267798417 has 2 divisors, whose sum is σ = 1267798418. Its totient is φ = 1267798416.

The previous prime is 1267798403. The next prime is 1267798421. The reversal of 1267798417 is 7148977621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644347456 + 623450961 = 25384^2 + 24969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1267798417 is a prime.

It is a super-3 number, since 3×1267798417³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1267798447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633899208 + 633899209.

It is an arithmetic number, because the mean of its divisors is an integer number (633899209).

Almost surely, 2^1267798417 is an apocalyptic number.

It is an amenable number.

1267798417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267798417 is an equidigital number, since it uses as much as digits as its factorization.

1267798417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 52.

The square root of 1267798417 is about 35606.1570097083. The cubic root of 1267798417 is about 1082.3060058042.

The spelling of 1267798417 in words is "one billion, two hundred sixty-seven million, seven hundred ninety-eight thousand, four hundred seventeen".