1385561 has 2 divisors, whose sum is σ = 1385562. Its totient is φ = 1385560.

The previous prime is 1385521. The next prime is 1385563. The reversal of 1385561 is 1655831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210000 + 175561 = 1100^2 + 419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1385561 is a prime.

It is a Sophie Germain prime.

Together with 1385563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1385563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692780 + 692781.

It is an arithmetic number, because the mean of its divisors is an integer number (692781).

2^1385561 is an apocalyptic number.

It is an amenable number.

1385561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385561 is an equidigital number, since it uses as much as digits as its factorization.

1385561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 1385561 is about 1177.0985515240. The cubic root of 1385561 is about 111.4829751400.

The spelling of 1385561 in words is "one million, three hundred eighty-five thousand, five hundred sixty-one".