551431155521 has 8 divisors (see below), whose sum is σ = 571581170688. Its totient is φ = 531428760000.

The previous prime is 551431155497. The next prime is 551431155577. The reversal of 551431155521 is 125551134155.

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 551431155521 - 2¹⁰ = 551431154497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551431158521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36897305 + ... + 36912246.

It is an arithmetic number, because the mean of its divisors is an integer number (71447646336).

Almost surely, 2^551431155521 is an apocalyptic number.

It is an amenable number.

551431155521 is a deficient number, since it is larger than the sum of its proper divisors (20150015167).

551431155521 is a wasteful number, since it uses less digits than its factorization.

551431155521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73809823.

The product of its digits is 75000, while the sum is 38.

Adding to 551431155521 its reverse (125551134155), we get a palindrome (676982289676).

The spelling of 551431155521 in words is "five hundred fifty-one billion, four hundred thirty-one million, one hundred fifty-five thousand, five hundred twenty-one".