55417891 has 2 divisors, whose sum is σ = 55417892. Its totient is φ = 55417890.

The previous prime is 55417867. The next prime is 55417907. The reversal of 55417891 is 19871455.

It is a happy number.

55417891 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 is a cyclic number.

It is not a de Polignac number, because 55417891 - 2⁷ = 55417763 is a prime.

It is a super-2 number, since 2×55417891² = 6142285285775762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55417391) 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, 27708945 + 27708946.

It is an arithmetic number, because the mean of its divisors is an integer number (27708946).

Almost surely, 2^55417891 is an apocalyptic number.

55417891 is a deficient number, since it is larger than the sum of its proper divisors (1).

55417891 is an equidigital number, since it uses as much as digits as its factorization.

55417891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 40.

The square root of 55417891 is about 7444.3193778881. The cubic root of 55417891 is about 381.2559803416.

The spelling of 55417891 in words is "fifty-five million, four hundred seventeen thousand, eight hundred ninety-one".