1065705521 has 2 divisors, whose sum is σ = 1065705522. Its totient is φ = 1065705520.

The previous prime is 1065705493. The next prime is 1065705523. The reversal of 1065705521 is 1255075601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 747475600 + 318229921 = 27340^2 + 17839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1065705521 - 2⁶ = 1065705457 is a prime.

It is a super-2 number, since 2×1065705521² = 2271456514979762882, which contains 22 as substring.

Together with 1065705523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1065705523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532852760 + 532852761.

It is an arithmetic number, because the mean of its divisors is an integer number (532852761).

Almost surely, 2^1065705521 is an apocalyptic number.

It is an amenable number.

1065705521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1065705521 is an equidigital number, since it uses as much as digits as its factorization.

1065705521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 1065705521 is about 32645.1454430823. The cubic root of 1065705521 is about 1021.4389280559.

The spelling of 1065705521 in words is "one billion, sixty-five million, seven hundred five thousand, five hundred twenty-one".