521225455 has 4 divisors (see below), whose sum is σ = 625470552. Its totient is φ = 416980360.

The previous prime is 521225407. The next prime is 521225459. The reversal of 521225455 is 554522125.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 521225455 - 2¹¹ = 521223407 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521225459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52122541 + ... + 52122550.

It is an arithmetic number, because the mean of its divisors is an integer number (156367638).

Almost surely, 2^521225455 is an apocalyptic number.

521225455 is a deficient number, since it is larger than the sum of its proper divisors (104245097).

521225455 is a wasteful number, since it uses less digits than its factorization.

521225455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104245096.

The product of its digits is 20000, while the sum is 31.

The square root of 521225455 is about 22830.3625682993. The cubic root of 521225455 is about 804.7763508174.

The spelling of 521225455 in words is "five hundred twenty-one million, two hundred twenty-five thousand, four hundred fifty-five".