551531521000 has 32 divisors (see below), whose sum is σ = 1290583761480. Its totient is φ = 220612608000.

The previous prime is 551531520941. The next prime is 551531521001. The reversal of 551531521000 is 125135155.

It can be written as a sum of positive squares in 4 ways, for example, as 125694357156 + 425837163844 = 354534^2 + 652562^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 551531521000.

It is not an unprimeable number, because it can be changed into a prime (551531521001) 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, 275764761 + ... + 275766760.

Almost surely, 2^551531521000 is an apocalyptic number.

551531521000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

551531521000 is an abundant number, since it is smaller than the sum of its proper divisors (739052240480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551531521000 is a wasteful number, since it uses less digits than its factorization.

551531521000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551531542 (or 551531528 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 28.

Adding to 551531521000 its reverse (125135155), we get a palindrome (551656656155).

The spelling of 551531521000 in words is "five hundred fifty-one billion, five hundred thirty-one million, five hundred twenty-one thousand".