551633609 has 2 divisors, whose sum is σ = 551633610. Its totient is φ = 551633608.

The previous prime is 551633603. The next prime is 551633681. The reversal of 551633609 is 906336155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318979600 + 232654009 = 17860^2 + 15253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551633609 is a prime.

It is not a weakly prime, because it can be changed into another prime (551633603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275816804 + 275816805.

It is an arithmetic number, because the mean of its divisors is an integer number (275816805).

Almost surely, 2^551633609 is an apocalyptic number.

It is an amenable number.

551633609 is a deficient number, since it is larger than the sum of its proper divisors (1).

551633609 is an equidigital number, since it uses as much as digits as its factorization.

551633609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 38.

The square root of 551633609 is about 23486.8816363518. The cubic root of 551633609 is about 820.1316509821.

The spelling of 551633609 in words is "five hundred fifty-one million, six hundred thirty-three thousand, six hundred nine".