55520613 has 8 divisors (see below), whose sum is σ = 82252800. Its totient is φ = 37013724.

The previous prime is 55520599. The next prime is 55520639. The reversal of 55520613 is 31602555.

It is not a de Polignac number, because 55520613 - 2⁵ = 55520581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2056319 = 55520613 / (5 + 5 + 5 + 2 + 0 + 6 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55520693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028133 + ... + 1028186.

It is an arithmetic number, because the mean of its divisors is an integer number (10281600).

Almost surely, 2^55520613 is an apocalyptic number.

It is an amenable number.

55520613 is a deficient number, since it is larger than the sum of its proper divisors (26732187).

55520613 is a wasteful number, since it uses less digits than its factorization.

55520613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056328 (or 2056322 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 55520613 is about 7451.2155384206. The cubic root of 55520613 is about 381.4913989244.

The spelling of 55520613 in words is "fifty-five million, five hundred twenty thousand, six hundred thirteen".