904513 has 2 divisors, whose sum is σ = 904514. Its totient is φ = 904512.

The previous prime is 904511. The next prime is 904517. The reversal of 904513 is 315409.

904513 = 672² + 673².

904513 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., 452929 + 451584 = 673^2 + 672^2 .

It is an emirp because it is prime and its reverse (315409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 904513 - 2¹ = 904511 is a prime.

Together with 904511, it forms a pair of twin primes.

It is equal to p₇₁₅₉₀ and since 904513 and 71590 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (904511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452256 + 452257.

It is an arithmetic number, because the mean of its divisors is an integer number (452257).

2⁹⁰⁴⁵¹³ is an apocalyptic number.

904513 is the 673-rd centered square number.

It is an amenable number.

904513 is a deficient number, since it is larger than the sum of its proper divisors (1).

904513 is an equidigital number, since it uses as much as digits as its factorization.

904513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 904513 is about 951.0588835608. The cubic root of 904513 is about 96.7100492289.

The spelling of 904513 in words is "nine hundred four thousand, five hundred thirteen".