854909521 has 2 divisors, whose sum is σ = 854909522. Its totient is φ = 854909520.

The previous prime is 854909423. The next prime is 854909543. The reversal of 854909521 is 125909458.

854909521 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., 518700625 + 336208896 = 22775^2 + 18336^2 .

It is a cyclic number.

It is not a de Polignac number, because 854909521 - 2²¹ = 852812369 is a prime.

It is not a weakly prime, because it can be changed into another prime (854909581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427454760 + 427454761.

It is an arithmetic number, because the mean of its divisors is an integer number (427454761).

Almost surely, 2^854909521 is an apocalyptic number.

It is an amenable number.

854909521 is a deficient number, since it is larger than the sum of its proper divisors (1).

854909521 is an equidigital number, since it uses as much as digits as its factorization.

854909521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 854909521 is about 29238.8358352380. The cubic root of 854909521 is about 949.0885148523.

The spelling of 854909521 in words is "eight hundred fifty-four million, nine hundred nine thousand, five hundred twenty-one".