55417381 has 2 divisors, whose sum is σ = 55417382. Its totient is φ = 55417380.

The previous prime is 55417337. The next prime is 55417391. The reversal of 55417381 is 18371455.

It is a happy number.

55417381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35212356 + 20205025 = 5934^2 + 4495^2 .

It is a cyclic number.

It is not a de Polignac number, because 55417381 - 2⁷ = 55417253 is a prime.

It is a super-2 number, since 2×55417381² = 6142172233798322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55417301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27708690 + 27708691.

It is an arithmetic number, because the mean of its divisors is an integer number (27708691).

Almost surely, 2^55417381 is an apocalyptic number.

It is an amenable number.

55417381 is a deficient number, since it is larger than the sum of its proper divisors (1).

55417381 is an equidigital number, since it uses as much as digits as its factorization.

55417381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 34.

The square root of 55417381 is about 7444.2851235025. The cubic root of 55417381 is about 381.2548107966.

The spelling of 55417381 in words is "fifty-five million, four hundred seventeen thousand, three hundred eighty-one".