521225408 has 42 divisors (see below), whose sum is σ = 1136899428. Its totient is φ = 236917120.

The previous prime is 521225407. The next prime is 521225459. The reversal of 521225408 is 804522125.

It is not an unprimeable number, because it can be changed into a prime (521225407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25910 + ... + 41397.

It is an arithmetic number, because the mean of its divisors is an integer number (27069034).

Almost surely, 2^521225408 is an apocalyptic number.

It is an amenable number.

521225408 is an abundant number, since it is smaller than the sum of its proper divisors (615674020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521225408 is a wasteful number, since it uses less digits than its factorization.

521225408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67341 (or 67320 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 521225408 is about 22830.3615389682. The cubic root of 521225408 is about 804.7763266280.

The spelling of 521225408 in words is "five hundred twenty-one million, two hundred twenty-five thousand, four hundred eight".