13485821 has 2 divisors, whose sum is σ = 13485822. Its totient is φ = 13485820.

The previous prime is 13485809. The next prime is 13485833. The reversal of 13485821 is 12858431.

It is a balanced prime because it is at equal distance from previous prime (13485809) and next prime (13485833).

It can be written as a sum of positive squares in only one way, i.e., 7672900 + 5812921 = 2770^2 + 2411^2 .

It is an emirp because it is prime and its reverse (12858431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13485821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13485881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6742910 + 6742911.

It is an arithmetic number, because the mean of its divisors is an integer number (6742911).

Almost surely, 2^13485821 is an apocalyptic number.

It is an amenable number.

13485821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13485821 is an equidigital number, since it uses as much as digits as its factorization.

13485821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 32.

The square root of 13485821 is about 3672.3045897638. The cubic root of 13485821 is about 238.0267665209.

The spelling of 13485821 in words is "thirteen million, four hundred eighty-five thousand, eight hundred twenty-one".