53408909 has 2 divisors, whose sum is σ = 53408910. Its totient is φ = 53408908.

The previous prime is 53408897. The next prime is 53408911. The reversal of 53408909 is 90980435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49420900 + 3988009 = 7030^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 53408909 - 2¹⁶ = 53343373 is a prime.

Together with 53408911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53408209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26704454 + 26704455.

It is an arithmetic number, because the mean of its divisors is an integer number (26704455).

Almost surely, 2^53408909 is an apocalyptic number.

It is an amenable number.

53408909 is a deficient number, since it is larger than the sum of its proper divisors (1).

53408909 is an equidigital number, since it uses as much as digits as its factorization.

53408909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 53408909 is about 7308.1399138221. The cubic root of 53408909 is about 376.5921261988.

The spelling of 53408909 in words is "fifty-three million, four hundred eight thousand, nine hundred nine".