521225505 has 24 divisors (see below), whose sum is σ = 903988800. Its totient is φ = 277823520.

The previous prime is 521225503. The next prime is 521225513. The reversal of 521225505 is 505522125.

It is not a de Polignac number, because 521225505 - 2¹ = 521225503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521225503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146700 + ... + 150210.

It is an arithmetic number, because the mean of its divisors is an integer number (37666200).

Almost surely, 2^521225505 is an apocalyptic number.

It is an amenable number.

521225505 is a deficient number, since it is larger than the sum of its proper divisors (382763295).

521225505 is a wasteful number, since it uses less digits than its factorization.

521225505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6821 (or 6818 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 521225505 is about 22830.3636633322. The cubic root of 521225505 is about 804.7763765509.

The spelling of 521225505 in words is "five hundred twenty-one million, two hundred twenty-five thousand, five hundred five".