55518761 has 2 divisors, whose sum is σ = 55518762. Its totient is φ = 55518760.

The previous prime is 55518733. The next prime is 55518829. The reversal of 55518761 is 16781555.

It is a happy number.

55518761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55413136 + 105625 = 7444^2 + 325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55518761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55518721) 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, 27759380 + 27759381.

It is an arithmetic number, because the mean of its divisors is an integer number (27759381).

Almost surely, 2^55518761 is an apocalyptic number.

It is an amenable number.

55518761 is a deficient number, since it is larger than the sum of its proper divisors (1).

55518761 is an equidigital number, since it uses as much as digits as its factorization.

55518761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42000, while the sum is 38.

The square root of 55518761 is about 7451.0912623588. The cubic root of 55518761 is about 381.4871570769.

The spelling of 55518761 in words is "fifty-five million, five hundred eighteen thousand, seven hundred sixty-one".