55440013 has 2 divisors, whose sum is σ = 55440014. Its totient is φ = 55440012.

The previous prime is 55439981. The next prime is 55440031. The reversal of 55440013 is 31004455.

Together with next prime (55440031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55308969 + 131044 = 7437^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 55440013 - 2⁵ = 55439981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55440313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27720006 + 27720007.

It is an arithmetic number, because the mean of its divisors is an integer number (27720007).

Almost surely, 2^55440013 is an apocalyptic number.

It is an amenable number.

55440013 is a deficient number, since it is larger than the sum of its proper divisors (1).

55440013 is an equidigital number, since it uses as much as digits as its factorization.

55440013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55440013 is about 7445.8050605693. The cubic root of 55440013 is about 381.3067041700.

Adding to 55440013 its reverse (31004455), we get a palindrome (86444468).

The spelling of 55440013 in words is "fifty-five million, four hundred forty thousand, thirteen".