55380047 has 2 divisors, whose sum is σ = 55380048. Its totient is φ = 55380046.

The previous prime is 55380019. The next prime is 55380077. The reversal of 55380047 is 74008355.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55380047 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55379995 and 55380022.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55380077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27690023 + 27690024.

It is an arithmetic number, because the mean of its divisors is an integer number (27690024).

Almost surely, 2^55380047 is an apocalyptic number.

55380047 is a deficient number, since it is larger than the sum of its proper divisors (1).

55380047 is an equidigital number, since it uses as much as digits as its factorization.

55380047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 55380047 is about 7441.7771399042. Note that the first 3 decimals coincide. The cubic root of 55380047 is about 381.1691760227.

The spelling of 55380047 in words is "fifty-five million, three hundred eighty thousand, forty-seven".