53989921 has 2 divisors, whose sum is σ = 53989922. Its totient is φ = 53989920.

The previous prime is 53989913. The next prime is 53989927. The reversal of 53989921 is 12998935.

53989921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52635025 + 1354896 = 7255^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 53989921 - 2³ = 53989913 is a prime.

It is not a weakly prime, because it can be changed into another prime (53989927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26994960 + 26994961.

It is an arithmetic number, because the mean of its divisors is an integer number (26994961).

Almost surely, 2^53989921 is an apocalyptic number.

It is an amenable number.

53989921 is a deficient number, since it is larger than the sum of its proper divisors (1).

53989921 is an equidigital number, since it uses as much as digits as its factorization.

53989921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 46.

The square root of 53989921 is about 7347.7834072596. The cubic root of 53989921 is about 377.9527973121.

The spelling of 53989921 in words is "fifty-three million, nine hundred eighty-nine thousand, nine hundred twenty-one".