53821613 has 2 divisors, whose sum is σ = 53821614. Its totient is φ = 53821612.

The previous prime is 53821601. The next prime is 53821657. The reversal of 53821613 is 31612835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27175369 + 26646244 = 5213^2 + 5162^2 .

It is a cyclic number.

It is not a de Polignac number, because 53821613 - 2²⁰ = 52773037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53821213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26910806 + 26910807.

It is an arithmetic number, because the mean of its divisors is an integer number (26910807).

Almost surely, 2^53821613 is an apocalyptic number.

It is an amenable number.

53821613 is a deficient number, since it is larger than the sum of its proper divisors (1).

53821613 is an equidigital number, since it uses as much as digits as its factorization.

53821613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 53821613 is about 7336.3214896841. The cubic root of 53821613 is about 377.5596455613.

The spelling of 53821613 in words is "fifty-three million, eight hundred twenty-one thousand, six hundred thirteen".