55516987 has 2 divisors, whose sum is σ = 55516988. Its totient is φ = 55516986.

The previous prime is 55516969. The next prime is 55516997. The reversal of 55516987 is 78961555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55516987 is a prime.

It is a super-3 number, since 3×55516987³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (55516997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27758493 + 27758494.

It is an arithmetic number, because the mean of its divisors is an integer number (27758494).

Almost surely, 2^55516987 is an apocalyptic number.

55516987 is a deficient number, since it is larger than the sum of its proper divisors (1).

55516987 is an equidigital number, since it uses as much as digits as its factorization.

55516987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 46.

The square root of 55516987 is about 7450.9722184424. The cubic root of 55516987 is about 381.4830937932.

The spelling of 55516987 in words is "fifty-five million, five hundred sixteen thousand, nine hundred eighty-seven".