55213219 has 2 divisors, whose sum is σ = 55213220. Its totient is φ = 55213218.

The previous prime is 55213217. The next prime is 55213231. The reversal of 55213219 is 91231255.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55213219 - 2¹ = 55213217 is a prime.

It is a super-2 number, since 2×55213219² = 6096999104683922, which contains 22 as substring.

Together with 55213217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55213211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27606609 + 27606610.

It is an arithmetic number, because the mean of its divisors is an integer number (27606610).

Almost surely, 2^55213219 is an apocalyptic number.

55213219 is a deficient number, since it is larger than the sum of its proper divisors (1).

55213219 is an equidigital number, since it uses as much as digits as its factorization.

55213219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 28.

The square root of 55213219 is about 7430.5598039448. The cubic root of 55213219 is about 380.7860437408.

The spelling of 55213219 in words is "fifty-five million, two hundred thirteen thousand, two hundred nineteen".