55844639 has 2 divisors, whose sum is σ = 55844640. Its totient is φ = 55844638.

The previous prime is 55844603. The next prime is 55844651. The reversal of 55844639 is 93644855.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55844639 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 55844639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55844689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27922319 + 27922320.

It is an arithmetic number, because the mean of its divisors is an integer number (27922320).

Almost surely, 2^55844639 is an apocalyptic number.

55844639 is a deficient number, since it is larger than the sum of its proper divisors (1).

55844639 is an equidigital number, since it uses as much as digits as its factorization.

55844639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 44.

The square root of 55844639 is about 7472.9270704323. The cubic root of 55844639 is about 382.2321054090.

The spelling of 55844639 in words is "fifty-five million, eight hundred forty-four thousand, six hundred thirty-nine".