55538773 has 2 divisors, whose sum is σ = 55538774. Its totient is φ = 55538772.

The previous prime is 55538771. The next prime is 55538783. The reversal of 55538773 is 37783555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40030929 + 15507844 = 6327^2 + 3938^2 .

It is a cyclic number.

It is not a de Polignac number, because 55538773 - 2¹ = 55538771 is a prime.

Together with 55538771, 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 (55538771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27769386 + 27769387.

It is an arithmetic number, because the mean of its divisors is an integer number (27769387).

Almost surely, 2^55538773 is an apocalyptic number.

It is an amenable number.

55538773 is a deficient number, since it is larger than the sum of its proper divisors (1).

55538773 is an equidigital number, since it uses as much as digits as its factorization.

55538773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 441000, while the sum is 43.

The square root of 55538773 is about 7452.4340319120. The cubic root of 55538773 is about 381.5329878541.

The spelling of 55538773 in words is "fifty-five million, five hundred thirty-eight thousand, seven hundred seventy-three".