551393521 has 24 divisors (see below), whose sum is σ = 681838560. Its totient is φ = 443060352.

The previous prime is 551393489. The next prime is 551393533. The reversal of 551393521 is 125393155.

551393521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 551393521 - 2⁵ = 551393489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551393561) 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, 234570 + ... + 236908.

It is an arithmetic number, because the mean of its divisors is an integer number (28409940).

Almost surely, 2^551393521 is an apocalyptic number.

It is an amenable number.

551393521 is a deficient number, since it is larger than the sum of its proper divisors (130445039).

551393521 is a wasteful number, since it uses less digits than its factorization.

551393521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653 (or 2646 counting only the distinct ones).

The product of its digits is 20250, while the sum is 34.

The square root of 551393521 is about 23481.7699716184. The cubic root of 551393521 is about 820.0126515002.

The spelling of 551393521 in words is "five hundred fifty-one million, three hundred ninety-three thousand, five hundred twenty-one".