521604953 has 4 divisors (see below), whose sum is σ = 521651328. Its totient is φ = 521558580.

The previous prime is 521604917. The next prime is 521604997. The reversal of 521604953 is 359406125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521604953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521654953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5588 + ... + 32778.

It is an arithmetic number, because the mean of its divisors is an integer number (130412832).

Almost surely, 2^521604953 is an apocalyptic number.

It is an amenable number.

521604953 is a deficient number, since it is larger than the sum of its proper divisors (46375).

521604953 is a wasteful number, since it uses less digits than its factorization.

521604953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46374.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 521604953 is about 22838.6723125492. The cubic root of 521604953 is about 804.9716194359.

The spelling of 521604953 in words is "five hundred twenty-one million, six hundred four thousand, nine hundred fifty-three".