55209719 has 2 divisors, whose sum is σ = 55209720. Its totient is φ = 55209718.

The previous prime is 55209673. The next prime is 55209743. The reversal of 55209719 is 91790255.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55209719 is a prime.

It is a super-2 number, since 2×55209719² = 6096226144117922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55209779) 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, 27604859 + 27604860.

It is an arithmetic number, because the mean of its divisors is an integer number (27604860).

Almost surely, 2^55209719 is an apocalyptic number.

55209719 is a deficient number, since it is larger than the sum of its proper divisors (1).

55209719 is an equidigital number, since it uses as much as digits as its factorization.

55209719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 55209719 is about 7430.3242863283. The cubic root of 55209719 is about 380.7779974834. Note that the first 3 decimals are identical.

The spelling of 55209719 in words is "fifty-five million, two hundred nine thousand, seven hundred nineteen".