1385521 has 2 divisors, whose sum is σ = 1385522. Its totient is φ = 1385520.

The previous prime is 1385507. The next prime is 1385561. The reversal of 1385521 is 1255831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1354896 + 30625 = 1164^2 + 175^2 .

It is an emirp because it is prime and its reverse (1255831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1385521 - 2⁷ = 1385393 is a prime.

It is a d-powerful number, because it can be written as 1 + 3¹⁰ + 8⁶ + 5³ + 5⁶ + 2²⁰ + 1 .

It is not a weakly prime, because it can be changed into another prime (1385561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692760 + 692761.

It is an arithmetic number, because the mean of its divisors is an integer number (692761).

2^1385521 is an apocalyptic number.

It is an amenable number.

1385521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385521 is an equidigital number, since it uses as much as digits as its factorization.

1385521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 1385521 is about 1177.0815604706. The cubic root of 1385521 is about 111.4819023225.

The spelling of 1385521 in words is "one million, three hundred eighty-five thousand, five hundred twenty-one".