55206719 has 2 divisors, whose sum is σ = 55206720. Its totient is φ = 55206718.

The previous prime is 55206707. The next prime is 55206721. The reversal of 55206719 is 91760255.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55206719 is a prime.

It is a super-2 number, since 2×55206719² = 6095563645489922, which contains 22 as substring.

Together with 55206721, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55206119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27603359 + 27603360.

It is an arithmetic number, because the mean of its divisors is an integer number (27603360).

Almost surely, 2^55206719 is an apocalyptic number.

55206719 is a deficient number, since it is larger than the sum of its proper divisors (1).

55206719 is an equidigital number, since it uses as much as digits as its factorization.

55206719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 55206719 is about 7430.1224081438. The cubic root of 55206719 is about 380.7711004207.

The spelling of 55206719 in words is "fifty-five million, two hundred six thousand, seven hundred nineteen".