53656121 has 2 divisors, whose sum is σ = 53656122. Its totient is φ = 53656120.

The previous prime is 53656111. The next prime is 53656147. The reversal of 53656121 is 12165635.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52998400 + 657721 = 7280^2 + 811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53656121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_3206846 and since 53656121 and 3206846 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (53656111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26828060 + 26828061.

It is an arithmetic number, because the mean of its divisors is an integer number (26828061).

Almost surely, 2^53656121 is an apocalyptic number.

It is an amenable number.

53656121 is a deficient number, since it is larger than the sum of its proper divisors (1).

53656121 is an equidigital number, since it uses as much as digits as its factorization.

53656121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 53656121 is about 7325.0338565770. The cubic root of 53656121 is about 377.1722717381.

The spelling of 53656121 in words is "fifty-three million, six hundred fifty-six thousand, one hundred twenty-one".