551470921 has 2 divisors, whose sum is σ = 551470922. Its totient is φ = 551470920.

The previous prime is 551470919. The next prime is 551470937. The reversal of 551470921 is 129074155.

551470921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 322705296 + 228765625 = 17964^2 + 15125^2 .

It is a cyclic number.

It is not a de Polignac number, because 551470921 - 2¹ = 551470919 is a prime.

Together with 551470919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (551470321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275735460 + 275735461.

It is an arithmetic number, because the mean of its divisors is an integer number (275735461).

Almost surely, 2^551470921 is an apocalyptic number.

It is an amenable number.

551470921 is a deficient number, since it is larger than the sum of its proper divisors (1).

551470921 is an equidigital number, since it uses as much as digits as its factorization.

551470921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 551470921 is about 23483.4180007937. The cubic root of 551470921 is about 820.0510185389.

The spelling of 551470921 in words is "five hundred fifty-one million, four hundred seventy thousand, nine hundred twenty-one".