55387081 has 2 divisors, whose sum is σ = 55387082. Its totient is φ = 55387080.

The previous prime is 55387069. The next prime is 55387093. The reversal of 55387081 is 18078355.

55387081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (55387069) and next prime (55387093).

It can be written as a sum of positive squares in only one way, i.e., 53523856 + 1863225 = 7316^2 + 1365^2 .

It is a cyclic number.

It is not a de Polignac number, because 55387081 - 2¹³ = 55378889 is a prime.

It is a super-2 number, since 2×55387081² = 6135457483401122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55387081.

It is not a weakly prime, because it can be changed into another prime (55387021) 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, 27693540 + 27693541.

It is an arithmetic number, because the mean of its divisors is an integer number (27693541).

Almost surely, 2^55387081 is an apocalyptic number.

It is an amenable number.

55387081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55387081 is an equidigital number, since it uses as much as digits as its factorization.

55387081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 55387081 is about 7442.2497270651. The cubic root of 55387081 is about 381.1853131854.

The spelling of 55387081 in words is "fifty-five million, three hundred eighty-seven thousand, eighty-one".