55691219 has 2 divisors, whose sum is σ = 55691220. Its totient is φ = 55691218.

The previous prime is 55691213. The next prime is 55691239. The reversal of 55691219 is 91219655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55691219 - 2¹² = 55687123 is a prime.

It is a super-2 number, since 2×55691219² = 6203023747411922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55691213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27845609 + 27845610.

It is an arithmetic number, because the mean of its divisors is an integer number (27845610).

Almost surely, 2^55691219 is an apocalyptic number.

55691219 is a deficient number, since it is larger than the sum of its proper divisors (1).

55691219 is an equidigital number, since it uses as much as digits as its factorization.

55691219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 38.

The square root of 55691219 is about 7462.6549565151. The cubic root of 55691219 is about 381.8817534653.

The spelling of 55691219 in words is "fifty-five million, six hundred ninety-one thousand, two hundred nineteen".