551435021 has 2 divisors, whose sum is σ = 551435022. Its totient is φ = 551435020.

The previous prime is 551434999. The next prime is 551435047. The reversal of 551435021 is 120534155.

551435021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (551435047) can be obtained adding 551435021 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 471975625 + 79459396 = 21725^2 + 8914^2 .

It is a cyclic number.

It is not a de Polignac number, because 551435021 - 2⁶ = 551434957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551435221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275717510 + 275717511.

It is an arithmetic number, because the mean of its divisors is an integer number (275717511).

Almost surely, 2^551435021 is an apocalyptic number.

It is an amenable number.

551435021 is a deficient number, since it is larger than the sum of its proper divisors (1).

551435021 is an equidigital number, since it uses as much as digits as its factorization.

551435021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 551435021 is about 23482.6536192143. The cubic root of 551435021 is about 820.0332234209.

Adding to 551435021 its reverse (120534155), we get a palindrome (671969176).

The spelling of 551435021 in words is "five hundred fifty-one million, four hundred thirty-five thousand, twenty-one".