55380287 has 2 divisors, whose sum is σ = 55380288. Its totient is φ = 55380286.

The previous prime is 55380233. The next prime is 55380301. The reversal of 55380287 is 78208355.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55380287 is a prime.

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 55380287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55389287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27690143 + 27690144.

It is an arithmetic number, because the mean of its divisors is an integer number (27690144).

Almost surely, 2^55380287 is an apocalyptic number.

55380287 is a deficient number, since it is larger than the sum of its proper divisors (1).

55380287 is an equidigital number, since it uses as much as digits as its factorization.

55380287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 55380287 is about 7441.7932650672. The cubic root of 55380287 is about 381.1697266450.

The spelling of 55380287 in words is "fifty-five million, three hundred eighty thousand, two hundred eighty-seven".