55394639 has 2 divisors, whose sum is σ = 55394640. Its totient is φ = 55394638.

The previous prime is 55394539. The next prime is 55394641. The reversal of 55394639 is 93649355.

55394639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55394639 - 2¹⁶ = 55329103 is a prime.

It is a Sophie Germain prime.

Together with 55394641, it forms a pair of twin primes.

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 55394639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55394659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27697319 + 27697320.

It is an arithmetic number, because the mean of its divisors is an integer number (27697320).

Almost surely, 2^55394639 is an apocalyptic number.

55394639 is a deficient number, since it is larger than the sum of its proper divisors (1).

55394639 is an equidigital number, since it uses as much as digits as its factorization.

55394639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 437400, while the sum is 44.

The square root of 55394639 is about 7442.7574863084. The cubic root of 55394639 is about 381.2026509683.

The spelling of 55394639 in words is "fifty-five million, three hundred ninety-four thousand, six hundred thirty-nine".