551222381 has 2 divisors, whose sum is σ = 551222382. Its totient is φ = 551222380.

The previous prime is 551222369. The next prime is 551222387. The reversal of 551222381 is 183222155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 523036900 + 28185481 = 22870^2 + 5309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551222381 is a prime.

It is a super-2 number, since 2×551222381² = 607692226630618322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551222387) 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, 275611190 + 275611191.

It is an arithmetic number, because the mean of its divisors is an integer number (275611191).

Almost surely, 2^551222381 is an apocalyptic number.

It is an amenable number.

551222381 is a deficient number, since it is larger than the sum of its proper divisors (1).

551222381 is an equidigital number, since it uses as much as digits as its factorization.

551222381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 551222381 is about 23478.1255853188. The cubic root of 551222381 is about 819.9278049666.

The spelling of 551222381 in words is "five hundred fifty-one million, two hundred twenty-two thousand, three hundred eighty-one".