55278319 has 2 divisors, whose sum is σ = 55278320. Its totient is φ = 55278318.

The previous prime is 55278313. The next prime is 55278329. The reversal of 55278319 is 91387255.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55278319 is a prime.

It is a super-2 number, since 2×55278319² = 6111385102931522, which contains 22 as substring.

It is equal to p_3297838 and since 55278319 and 3297838 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55278313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27639159 + 27639160.

It is an arithmetic number, because the mean of its divisors is an integer number (27639160).

Almost surely, 2^55278319 is an apocalyptic number.

55278319 is a deficient number, since it is larger than the sum of its proper divisors (1).

55278319 is an equidigital number, since it uses as much as digits as its factorization.

55278319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 55278319 is about 7434.9390717073. The cubic root of 55278319 is about 380.9356421859.

The spelling of 55278319 in words is "fifty-five million, two hundred seventy-eight thousand, three hundred nineteen".