55439863 has 2 divisors, whose sum is σ = 55439864. Its totient is φ = 55439862.

The previous prime is 55439861. The next prime is 55439869. The reversal of 55439863 is 36893455.

55439863 is nontrivially palindromic in base 13.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55439863 - 2¹ = 55439861 is a prime.

Together with 55439861, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55439861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27719931 + 27719932.

It is an arithmetic number, because the mean of its divisors is an integer number (27719932).

Almost surely, 2^55439863 is an apocalyptic number.

55439863 is a deficient number, since it is larger than the sum of its proper divisors (1).

55439863 is an equidigital number, since it uses as much as digits as its factorization.

55439863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 43.

The square root of 55439863 is about 7445.7949877767. The cubic root of 55439863 is about 381.3063602784.

The spelling of 55439863 in words is "fifty-five million, four hundred thirty-nine thousand, eight hundred sixty-three".