55206919 has 2 divisors, whose sum is σ = 55206920. Its totient is φ = 55206918.

The previous prime is 55206917. The next prime is 55206929. The reversal of 55206919 is 91960255.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55206919 - 2¹ = 55206917 is a prime.

It is a super-2 number, since 2×55206919² = 6095607810945122, which contains 22 as substring.

Together with 55206917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55206917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27603459 + 27603460.

It is an arithmetic number, because the mean of its divisors is an integer number (27603460).

Almost surely, 2^55206919 is an apocalyptic number.

55206919 is a deficient number, since it is larger than the sum of its proper divisors (1).

55206919 is an equidigital number, since it uses as much as digits as its factorization.

55206919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 55206919 is about 7430.1358668600. The cubic root of 55206919 is about 380.7715602326.

The spelling of 55206919 in words is "fifty-five million, two hundred six thousand, nine hundred nineteen".