53404721 has 2 divisors, whose sum is σ = 53404722. Its totient is φ = 53404720.

The previous prime is 53404699. The next prime is 53404787. The reversal of 53404721 is 12740435.

53404721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51552400 + 1852321 = 7180^2 + 1361^2 .

It is a cyclic number.

It is not a de Polignac number, because 53404721 - 2⁶ = 53404657 is a prime.

It is not a weakly prime, because it can be changed into another prime (53404121) 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, 26702360 + 26702361.

It is an arithmetic number, because the mean of its divisors is an integer number (26702361).

Almost surely, 2^53404721 is an apocalyptic number.

It is an amenable number.

53404721 is a deficient number, since it is larger than the sum of its proper divisors (1).

53404721 is an equidigital number, since it uses as much as digits as its factorization.

53404721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 53404721 is about 7307.8533783868. The cubic root of 53404721 is about 376.5822825910.

The spelling of 53404721 in words is "fifty-three million, four hundred four thousand, seven hundred twenty-one".