55468781 has 2 divisors, whose sum is σ = 55468782. Its totient is φ = 55468780.

The previous prime is 55468769. The next prime is 55468783. The reversal of 55468781 is 18786455.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40576900 + 14891881 = 6370^2 + 3859^2 .

It is a cyclic number.

It is not a de Polignac number, because 55468781 - 2¹⁸ = 55206637 is a prime.

It is a super-2 number, since 2×55468781² = 6153571331251922, which contains 22 as substring.

Together with 55468783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55468783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27734390 + 27734391.

It is an arithmetic number, because the mean of its divisors is an integer number (27734391).

Almost surely, 2^55468781 is an apocalyptic number.

It is an amenable number.

55468781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55468781 is an equidigital number, since it uses as much as digits as its factorization.

55468781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 268800, while the sum is 44.

The square root of 55468781 is about 7447.7366360526. The cubic root of 55468781 is about 381.3726465214.

The spelling of 55468781 in words is "fifty-five million, four hundred sixty-eight thousand, seven hundred eighty-one".