551131021 has 8 divisors (see below), whose sum is σ = 646887680. Its totient is φ = 459630288.

The previous prime is 551131019. The next prime is 551131033. The reversal of 551131021 is 120131155.

551131021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 551131021 - 2¹ = 551131019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551131021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551131001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1063701 + ... + 1064218.

It is an arithmetic number, because the mean of its divisors is an integer number (80860960).

Almost surely, 2^551131021 is an apocalyptic number.

It is an amenable number.

551131021 is a deficient number, since it is larger than the sum of its proper divisors (95756659).

551131021 is a wasteful number, since it uses less digits than its factorization.

551131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127963.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 551131021 is about 23476.1798638535. The cubic root of 551131021 is about 819.8825039860.

Adding to 551131021 its reverse (120131155), we get a palindrome (671262176).

The spelling of 551131021 in words is "five hundred fifty-one million, one hundred thirty-one thousand, twenty-one".