551801189 has 2 divisors, whose sum is σ = 551801190. Its totient is φ = 551801188.

The previous prime is 551801177. The next prime is 551801191. The reversal of 551801189 is 981108155.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 283922500 + 267878689 = 16850^2 + 16367^2 .

It is a cyclic number.

It is not a de Polignac number, because 551801189 - 2²⁰ = 550752613 is a prime.

Together with 551801191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551804189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275900594 + 275900595.

It is an arithmetic number, because the mean of its divisors is an integer number (275900595).

Almost surely, 2^551801189 is an apocalyptic number.

It is an amenable number.

551801189 is a deficient number, since it is larger than the sum of its proper divisors (1).

551801189 is an equidigital number, since it uses as much as digits as its factorization.

551801189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 38.

The square root of 551801189 is about 23490.4488888569. The cubic root of 551801189 is about 820.2146914549.

The spelling of 551801189 in words is "five hundred fifty-one million, eight hundred one thousand, one hundred eighty-nine".