1265603 has 2 divisors, whose sum is σ = 1265604. Its totient is φ = 1265602.

The previous prime is 1265597. The next prime is 1265611. The reversal of 1265603 is 3065621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1265603 - 2⁸ = 1265347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632801 + 632802.

It is an arithmetic number, because the mean of its divisors is an integer number (632802).

2^1265603 is an apocalyptic number.

1265603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265603 is an equidigital number, since it uses as much as digits as its factorization.

1265603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1265603 is about 1124.9902221797. The cubic root of 1265603 is about 108.1680910141.

The spelling of 1265603 in words is "one million, two hundred sixty-five thousand, six hundred three".