1267725419 has 2 divisors, whose sum is σ = 1267725420. Its totient is φ = 1267725418.

The previous prime is 1267725379. The next prime is 1267725421. The reversal of 1267725419 is 9145277621.

It is a strong prime.

It is an emirp because it is prime and its reverse (9145277621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1267725419 is a prime.

It is a super-2 number, since 2×1267725419² = 3214255475957451122, which contains 22 as substring.

Together with 1267725421, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1267725419.

It is not a weakly prime, because it can be changed into another prime (1267725919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633862709 + 633862710.

It is an arithmetic number, because the mean of its divisors is an integer number (633862710).

Almost surely, 2^1267725419 is an apocalyptic number.

1267725419 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267725419 is an equidigital number, since it uses as much as digits as its factorization.

1267725419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 1267725419 is about 35605.1319194298. The cubic root of 1267725419 is about 1082.2852328671.

The spelling of 1267725419 in words is "one billion, two hundred sixty-seven million, seven hundred twenty-five thousand, four hundred nineteen".