551551521 has 4 divisors (see below), whose sum is σ = 735402032. Its totient is φ = 367701012.

The previous prime is 551551487. The next prime is 551551537. The reversal of 551551521 is 125155155.

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.

It is not a de Polignac number, because 551551521 - 2¹⁰ = 551550497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551558521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91925251 + ... + 91925256.

It is an arithmetic number, because the mean of its divisors is an integer number (183850508).

Almost surely, 2^551551521 is an apocalyptic number.

It is an amenable number.

551551521 is a deficient number, since it is larger than the sum of its proper divisors (183850511).

551551521 is a wasteful number, since it uses less digits than its factorization.

551551521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183850510.

The product of its digits is 6250, while the sum is 30.

The square root of 551551521 is about 23485.1340426236. The cubic root of 551551521 is about 820.0909679964.

The spelling of 551551521 in words is "five hundred fifty-one million, five hundred fifty-one thousand, five hundred twenty-one".