1265967851 has 2 divisors, whose sum is σ = 1265967852. Its totient is φ = 1265967850.

The previous prime is 1265967847. The next prime is 1265967893. The reversal of 1265967851 is 1587695621.

It is a weak prime.

It is an emirp because it is prime and its reverse (1587695621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265967851 - 2² = 1265967847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1265967851.

It is not a weakly prime, because it can be changed into another prime (1265967821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632983925 + 632983926.

It is an arithmetic number, because the mean of its divisors is an integer number (632983926).

Almost surely, 2^1265967851 is an apocalyptic number.

1265967851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265967851 is an equidigital number, since it uses as much as digits as its factorization.

1265967851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 50.

The square root of 1265967851 is about 35580.4419730840. The cubic root of 1265967851 is about 1081.7848433234.

The spelling of 1265967851 in words is "one billion, two hundred sixty-five million, nine hundred sixty-seven thousand, eight hundred fifty-one".