531440005551 has 48 divisors (see below), whose sum is σ = 888877108224. Its totient is φ = 279941973696.

The previous prime is 531440005543. The next prime is 531440005553. The reversal of 531440005551 is 155500044135.

It is not a de Polignac number, because 531440005551 - 2³ = 531440005543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531440005553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1232730 + ... + 1607016.

It is an arithmetic number, because the mean of its divisors is an integer number (18518273088).

Almost surely, 2^531440005551 is an apocalyptic number.

531440005551 is a deficient number, since it is larger than the sum of its proper divisors (357437102673).

531440005551 is a wasteful number, since it uses less digits than its factorization.

531440005551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375060 (or 375053 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 33.

Adding to 531440005551 its reverse (155500044135), we get a palindrome (686940049686).

The spelling of 531440005551 in words is "five hundred thirty-one billion, four hundred forty million, five thousand, five hundred fifty-one".