551221219 has 2 divisors, whose sum is σ = 551221220. Its totient is φ = 551221218.

The previous prime is 551221213. The next prime is 551221271. The reversal of 551221219 is 912122155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551221219 - 2³ = 551221211 is a prime.

It is a super-2 number, since 2×551221219² = 607689664551691922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (551221211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275610609 + 275610610.

It is an arithmetic number, because the mean of its divisors is an integer number (275610610).

Almost surely, 2^551221219 is an apocalyptic number.

551221219 is a deficient number, since it is larger than the sum of its proper divisors (1).

551221219 is an equidigital number, since it uses as much as digits as its factorization.

551221219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 28.

The square root of 551221219 is about 23478.1008388668. The cubic root of 551221219 is about 819.9272288187.

The spelling of 551221219 in words is "five hundred fifty-one million, two hundred twenty-one thousand, two hundred nineteen".