55787 has 2 divisors, whose sum is σ = 55788. Its totient is φ = 55786.

The previous prime is 55763. The next prime is 55793. The reversal of 55787 is 78755.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55787 - 2¹² = 51691 is a prime.

It is a super-2 number, since 2×55787² = 6224378738, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27893 + 27894.

It is an arithmetic number, because the mean of its divisors is an integer number (27894).

2⁵⁵⁷⁸⁷ is an apocalyptic number.

55787 is a deficient number, since it is larger than the sum of its proper divisors (1).

55787 is an equidigital number, since it uses as much as digits as its factorization.

55787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9800, while the sum is 32.

The square root of 55787 is about 236.1927179233. The cubic root of 55787 is about 38.2100555566.

Subtracting from 55787 its sum of digits (32), we obtain a palindrome (55755).

The spelling of 55787 in words is "fifty-five thousand, seven hundred eighty-seven".