1265661 has 6 divisors (see below), whose sum is σ = 1828190. Its totient is φ = 843768.

The previous prime is 1265657. The next prime is 1265681. The reversal of 1265661 is 1665621.

It is a happy number.

1265661 is a `hidden beast` number, since 1 + 2 + 656 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1265625 + 36 = 1125^2 + 6^2 .

It is not a de Polignac number, because 1265661 - 2² = 1265657 is a prime.

It is a Duffinian number.

1265661 is a lucky number.

It is a congruent number.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70306 + ... + 70323.

2^1265661 is an apocalyptic number.

It is an amenable number.

1265661 is a deficient number, since it is larger than the sum of its proper divisors (562529).

1265661 is a wasteful number, since it uses less digits than its factorization.

1265661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140635 (or 140632 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1265661 is about 1125.0159998862. The cubic root of 1265661 is about 108.1697433630.

The spelling of 1265661 in words is "one million, two hundred sixty-five thousand, six hundred sixty-one".