551633540 has 24 divisors (see below), whose sum is σ = 1180289880. Its totient is φ = 216489728.

The previous prime is 551633531. The next prime is 551633543. The reversal of 551633540 is 45336155.

It can be written as a sum of positive squares in 4 ways, for example, as 52736644 + 498896896 = 7262^2 + 22336^2 .

It is a junction number, because it is equal to n+sod(n) for n = 551633497 and 551633506.

It is not an unprimeable number, because it can be changed into a prime (551633543) 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, 259145 + ... + 261264.

It is an arithmetic number, because the mean of its divisors is an integer number (49178745).

Almost surely, 2^551633540 is an apocalyptic number.

It is an amenable number.

551633540 is an abundant number, since it is smaller than the sum of its proper divisors (628656340).

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

551633540 is a wasteful number, since it uses less digits than its factorization.

551633540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520471 (or 520469 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 551633540 is about 23486.8801674467. The cubic root of 551633540 is about 820.1316167872.

Adding to 551633540 its reverse (45336155), we get a palindrome (596969695).

The spelling of 551633540 in words is "five hundred fifty-one million, six hundred thirty-three thousand, five hundred forty".