1265865241 has 9 divisors (see below), whose sum is σ = 1295082399. Its totient is φ = 1237295304.

The previous prime is 1265865221. The next prime is 1265865257. The reversal of 1265865241 is 1425685621.

The square root of 1265865241 is 35579.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 782041225 + 483824016 = 27965^2 + 21996^2 .

It is not a de Polignac number, because 1265865241 - 2⁷ = 1265865113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1265865194 and 1265865203.

It is not an unprimeable number, because it can be changed into a prime (1265865221) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1671835 + ... + 1672591.

Almost surely, 2^1265865241 is an apocalyptic number.

1265865241 is the 35579-th square number.

1265865241 is the 17790-th centered octagonal number.

It is an amenable number.

1265865241 is a deficient number, since it is larger than the sum of its proper divisors (29217158).

1265865241 is an frugal number, since it uses more digits than its factorization.

1265865241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608 (or 804 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The cubic root of 1265865241 is about 1081.7556153716.

The spelling of 1265865241 in words is "one billion, two hundred sixty-five million, eight hundred sixty-five thousand, two hundred forty-one".