551188381 has 2 divisors, whose sum is σ = 551188382. Its totient is φ = 551188380.

The previous prime is 551188369. The next prime is 551188403. The reversal of 551188381 is 183881155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538472025 + 12716356 = 23205^2 + 3566^2 .

It is a cyclic number.

It is not a de Polignac number, because 551188381 - 2⁹ = 551187869 is a prime.

It is a super-3 number, since 3×551188381³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551188301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275594190 + 275594191.

It is an arithmetic number, because the mean of its divisors is an integer number (275594191).

Almost surely, 2^551188381 is an apocalyptic number.

It is an amenable number.

551188381 is a deficient number, since it is larger than the sum of its proper divisors (1).

551188381 is an equidigital number, since it uses as much as digits as its factorization.

551188381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 40.

The square root of 551188381 is about 23477.4014959067. The cubic root of 551188381 is about 819.9109466050.

The spelling of 551188381 in words is "five hundred fifty-one million, one hundred eighty-eight thousand, three hundred eighty-one".