551511320431 has 16 divisors (see below), whose sum is σ = 587114136000. Its totient is φ = 517071437568.

The previous prime is 551511320413. The next prime is 551511320473. The reversal of 551511320431 is 134023115155.

It is a cyclic number.

It is not a de Polignac number, because 551511320431 - 2¹³ = 551511312239 is a prime.

It is a super-2 number, since 2×551511320431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551511320393 and 551511320402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551511920431) 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 15 ways as a sum of consecutive naturals, for example, 28795 + ... + 1050643.

It is an arithmetic number, because the mean of its divisors is an integer number (36694633500).

Almost surely, 2^551511320431 is an apocalyptic number.

551511320431 is a deficient number, since it is larger than the sum of its proper divisors (35602815569).

551511320431 is a wasteful number, since it uses less digits than its factorization.

551511320431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022418.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 551511320431 its reverse (134023115155), we get a palindrome (685534435586).

The spelling of 551511320431 in words is "five hundred fifty-one billion, five hundred eleven million, three hundred twenty thousand, four hundred thirty-one".