1265813 has 2 divisors, whose sum is σ = 1265814. Its totient is φ = 1265812.

The previous prime is 1265801. The next prime is 1265827. The reversal of 1265813 is 3185621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 908209 + 357604 = 953^2 + 598^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265813 - 2⁸ = 1265557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632906 + 632907.

It is an arithmetic number, because the mean of its divisors is an integer number (632907).

2^1265813 is an apocalyptic number.

It is an amenable number.

1265813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265813 is an equidigital number, since it uses as much as digits as its factorization.

1265813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 1265813 is about 1125.0835524529. The cubic root of 1265813 is about 108.1740734174.

The spelling of 1265813 in words is "one million, two hundred sixty-five thousand, eight hundred thirteen".