551431252521 has 20 divisors (see below), whose sum is σ = 823779728772. Its totient is φ = 367604435808.

The previous prime is 551431252487. The next prime is 551431252549. The reversal of 551431252521 is 125252134155.

551431252521 is a `hidden beast` number, since 5 + 5 + 1 + 4 + 3 + 125 + 2 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 58677795225 + 492753457296 = 242235^2 + 701964^2 .

It is not a de Polignac number, because 551431252521 - 2¹⁴ = 551431236137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551431252571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1834555 + ... + 2113871.

Almost surely, 2^551431252521 is an apocalyptic number.

It is an amenable number.

551431252521 is a deficient number, since it is larger than the sum of its proper divisors (272348476251).

551431252521 is a wasteful number, since it uses less digits than its factorization.

551431252521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303702 (or 303693 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

Adding to 551431252521 its reverse (125252134155), we get a palindrome (676683386676).

The spelling of 551431252521 in words is "five hundred fifty-one billion, four hundred thirty-one million, two hundred fifty-two thousand, five hundred twenty-one".