1265641 has 6 divisors (see below), whose sum is σ = 1370670. Its totient is φ = 1168128.

The previous prime is 1265639. The next prime is 1265653. The reversal of 1265641 is 1465621.

1265641 = 795² + 796².

It can be written as a sum of positive squares in 3 ways, for example, as 16 + 1265625 = 4^2 + 1125^2 .

It is not a de Polignac number, because 1265641 - 2¹ = 1265639 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3576 + ... + 3913.

It is an arithmetic number, because the mean of its divisors is an integer number (228445).

2^1265641 is an apocalyptic number.

1265641 is the 796-th centered square number.

It is an amenable number.

1265641 is a deficient number, since it is larger than the sum of its proper divisors (105029).

1265641 is an equidigital number, since it uses as much as digits as its factorization.

1265641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7515 (or 7502 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 1265641 is about 1125.0071110886. The cubic root of 1265641 is about 108.1691735932.

The spelling of 1265641 in words is "one million, two hundred sixty-five thousand, six hundred forty-one".