52904021 has 2 divisors, whose sum is σ = 52904022. Its totient is φ = 52904020.

The previous prime is 52903973. The next prime is 52904029. The reversal of 52904021 is 12040925.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40576900 + 12327121 = 6370^2 + 3511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52904021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52904029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26452010 + 26452011.

It is an arithmetic number, because the mean of its divisors is an integer number (26452011).

Almost surely, 2^52904021 is an apocalyptic number.

It is an amenable number.

52904021 is a deficient number, since it is larger than the sum of its proper divisors (1).

52904021 is an equidigital number, since it uses as much as digits as its factorization.

52904021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 52904021 is about 7273.5150374492. The cubic root of 52904021 is about 375.4016934113.

Adding to 52904021 its reverse (12040925), we get a palindrome (64944946).

The spelling of 52904021 in words is "fifty-two million, nine hundred four thousand, twenty-one".