1265521 has 2 divisors, whose sum is σ = 1265522. Its totient is φ = 1265520.

The previous prime is 1265519. The next prime is 1265527. The reversal of 1265521 is 1255621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 829921 + 435600 = 911^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265521 - 2¹ = 1265519 is a prime.

Together with 1265519, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1265492 and 1265501.

It is not a weakly prime, because it can be changed into another prime (1265527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632760 + 632761.

It is an arithmetic number, because the mean of its divisors is an integer number (632761).

2^1265521 is an apocalyptic number.

It is an amenable number.

1265521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265521 is an equidigital number, since it uses as much as digits as its factorization.

1265521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 22.

The square root of 1265521 is about 1124.9537768282. The cubic root of 1265521 is about 108.1657548483.

The spelling of 1265521 in words is "one million, two hundred sixty-five thousand, five hundred twenty-one".