1265320843 has 2 divisors, whose sum is σ = 1265320844. Its totient is φ = 1265320842.

The previous prime is 1265320841. The next prime is 1265320867. The reversal of 1265320843 is 3480235621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1265320843 - 2¹ = 1265320841 is a prime.

Together with 1265320841, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1265320799 and 1265320808.

It is not a weakly prime, because it can be changed into another prime (1265320841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632660421 + 632660422.

It is an arithmetic number, because the mean of its divisors is an integer number (632660422).

Almost surely, 2^1265320843 is an apocalyptic number.

1265320843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265320843 is an equidigital number, since it uses as much as digits as its factorization.

1265320843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 1265320843 is about 35571.3486249819. The cubic root of 1265320843 is about 1081.6005198643.

The spelling of 1265320843 in words is "one billion, two hundred sixty-five million, three hundred twenty thousand, eight hundred forty-three".