551755621 has 12 divisors (see below), whose sum is σ = 587370820. Its totient is φ = 518192640.

The previous prime is 551755597. The next prime is 551755637. The reversal of 551755621 is 126557155.

551755621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 22500 + 551733121 = 150^2 + 23489^2 .

It is a de Polignac number, because none of the positive numbers 2^k-551755621 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551755651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154585 + ... + 158113.

Almost surely, 2^551755621 is an apocalyptic number.

It is an amenable number.

551755621 is a deficient number, since it is larger than the sum of its proper divisors (35615199).

551755621 is a wasteful number, since it uses less digits than its factorization.

551755621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104 (or 4087 counting only the distinct ones).

The product of its digits is 52500, while the sum is 37.

The square root of 551755621 is about 23489.4789427096. The cubic root of 551755621 is about 820.1921129292.

The spelling of 551755621 in words is "five hundred fifty-one million, seven hundred fifty-five thousand, six hundred twenty-one".